CN201324957Y

CN201324957Y - Precision positioning and clamping device for machine tool

Info

Publication number: CN201324957Y
Application number: CNU2008202228563U
Authority: CN
Inventors: 杨振宇
Original assignee: Changzheng Machinery Factory China Aerospace Science and Technology Corp
Current assignee: Changzheng Machinery Factory China Aerospace Science and Technology Corp
Priority date: 2008-11-24
Filing date: 2008-11-24
Publication date: 2009-10-14
Anticipated expiration: 2018-11-24

Abstract

The utility model relates to a precision positioning and clamping device for a machine tool, which comprises a clamp seat, a clamp body, an elastic sleeve and a fastening nut; the clamp body is connected and fixed with the clamp seat by screws; the fastening nut is fixed with the bolts of the clamp body; the upper end of the elastic sleeve is fixedly connected with the fastening nut; wherein the two ends of the elastic sleeve are respectively provided with a plurality of slits with a quantity being the multiple of 3; and the distance between any two slits is the same. Workpieces are arranged in the elastic sleeve and are limited by a positioning block in the axial direction; the external conical surface of the elastic sleeve and the corresponding conical surface of the clamp body are collaboratively centered by conicity; the fastening nut is screwed to drive the elastic sleeve to generate an axial displacement, thereby changing the inner diameter of the sleeve and clamping the workpieces. The precision positioning and clamping device can be provided with a certain amount of elastic sleeves according to the demands of elements and the inner diameters of the elastic sleeves change, thus being applicable to the elements with different sizes. The precision positioning and clamping device prevents the increase of processes and repetitive design of the fixture in the mechanical machining course, thus saving time and cost.

Description

Precision positioning and clamping device of lathe

Technical field

The utility model relates to a kind of turning attachment, particularly a kind of precision positioning and clamping device of lathe.

Background technology

Group technology (Group technology) is called for short GT.Be that similar various parts of a kind of many shapes, size or process route and product form grouping, thereby improve a kind of technology of production lot.Along with the develop rapidly of The present computer technology and Numeric Control Technology, they combine with group technology, so form based on flexible manufacturing system (FMS) and CAPP System (CAPP).

The basic principle of group technology shows that the similitude of part is to realize the primary condition of GT.The similitude of technology makes part can adopt identical process to process, and adopts similar anchor clamps to be installed, and adopts that similar amount instrument is measured etc.

The numerically controlled lathe universal fixturing comprises inside and outside circle gripping mechanisms such as scroll chuck, chuck, claw.Universal fixturing is in order to have good adaptability and versatility, and dimension series is by standardization gradually, and the roughing and the fining-off process of common parts extensively adopt preferably in self rigidity.And in the relatively poor fine finishining process of self rigidity, all adopt methods such as joining soft pawl of car or mandrel tensioner to position chucking usually such as thin walled cylinder body class part, to prevent its distortion that is installed.Owing to reasons such as abundant are not considered in the manufacturability design in design process of various machine components, make that appearance and size is ever-changing and do not have specific rule, cause part technology and frock repeatability design work in mechanical processing process to increase, and then cause the waste of time resource and the raising of cost.

The anchor clamps of similar principles also often are used to being installed of small-sized cutter on the machining center or workpiece, but owing to be subjected to its structural limitations, are not suitable for the above part of clamping diameter 20mm.

The utility model content

The utility model aims to provide a kind of precision positioning and clamping device of lathe, this device can be realized accurately location and laborsaving clamping, and can reduce the distortion that is installed, the more important thing is the generalization that realized clamp body and the standardization and the serializing of crucial setting element, for the enforcement of GT and flexible manufacturing provides hardware supported.

The utility model adopts following technical scheme in order to achieve the above object: a kind of precision positioning and clamping device of lathe comprises clamping fixture seat, clamp body, resilient sleeve, clamp nut, clamp body is connected and fixed by screw and clamping fixture seat, clamp nut and clamp body bolting, the resilient sleeve upper end is connected and fixed with clamp nut.Wherein, the even respectively some slits that distribute in resilient sleeve two ends, its quantity is got 3 multiple, and the distance between any two slits all equates.Workpiece places in the resilient sleeve, and is axially spacing by position block.The corresponding conical surface is felt relieved by taper fit on resilient sleeve male cone (strobilus masculinus) and the clamp body, and the rotation clamp nut then produces axial displacement by rotating band dynamic elasticity sleeve, thereby changes the sleeve diameter size, and then the chucking workpiece.

The utility model can be according to the needs of part family, and the resilient sleeve of configuration some makes its internal diameter varies, thereby goes for the part of multiple size.Avoided that technology and the work of frock design iterations increase in the mechanical processing process, thereby saved time and cost.

Description of drawings

Fig. 1 is the utility model stereogram;

Sectional view when Fig. 2 is the utility model user mode.

The specific embodiment

Below in conjunction with the drawings and specific embodiments the utility model is done more detailed explanation.

Consult Fig. 1, Fig. 2, a kind of precision positioning and clamping device of lathe comprises clamping fixture seat 1, clamp body 3, resilient sleeve 5, clamp nut 4.Clamp body 3 is connected and fixed by screw 2 and clamping fixture seat 1, resilient sleeve 5 two ends evenly are provided with some slits 7 respectively, 7 distances of any two slits equate, and resilient sleeve 5 outside conical surfaces are corresponding with clamp body 3 inboard cone faces, and clamp nut 4 passes through bolting with clamp body 3.Set slit 7 is used to weaken sleeve radial deformation rigidity on the resilient sleeve 5, reduces resistance of deformation, increases contact area and contact stiffness between part, and slit 7 quantity are set according to processing work 1, and quantity is always 3 multiple.Resilient sleeve 5 is as setting element, and its profile is specific dimension series.The utility model is applicable to the location and the clamping of the above low rigidity revolving parts of diameter 50mm.

During use, workpiece 1 is put into resilient sleeve 5, clockwise rotate clamp nut 4, promote resilient sleeve 5 to clamp body 3 inner moving, the radial dimension of resilient sleeve 5 is subjected to the oppressed distortion of clamp body 3 pressure effects, and resilient sleeve 5 internal diameters diminish, thus clamping work pieces 6.Wherein, the radial-deformation of resilient sleeve 5 is proportional to axial displacement, and equates on the length sleeve direction everywhere.Because distortion, the shape in sleeve cross section also becomes about axial symmetry but non-concyclic plurality of sector zone, also being contacted by face in theory with clamp body 3 taper hole contact zones and to become line contact, also is that so this way of contact has improved centering precision to a certain extent with 1 contact of workpiece.

When taking out workpiece 1, then be rotated counterclockwise clamp nut 4, the pulling sleeve outwards moves, and constraint reaction is eliminated, and resilient sleeve 5 recovers nature, thereby unclamps workpiece 1.

Adopt the utility model, the self-locking that little taper fit produced between clamp body 3 and the resilient sleeve 5, when clamp nut 4 axial advance resilient sleeves 5 during to certain depth, the axial thrust load of normal direction restraining force and frictional force balance each other between interior male cone (strobilus masculinus), reduced requirement of strength, reduced the axial dimension of nut and the pretightning force that is installed nut.

Simultaneously, resilient sleeve 5 contacts the contact stiffness that has improved between radial location precision and part with multiple spot between clamp body 4 and the workpiece 1, makes process system rigidity further improve.And the design size of position block and resilient sleeve 5 is easy to seriation and standardization, has shortened the technological preparation time, has improved operability.

Claims

1. precision positioning and clamping device of lathe, comprise clamping fixture seat, clamp body, resilient sleeve, clamp nut, it is characterized in that, clamp body is connected and fixed by screw and clamping fixture seat, the resilient sleeve two ends evenly are provided with some slits respectively, and any two slit separations are from equating that the resilient sleeve outside conical surface is corresponding with clamp body inboard cone face, clamp nut and clamp body bolting, the resilient sleeve upper end is connected and fixed with clamp nut.

2. according to the described a kind of precision positioning and clamping device of lathe of claim 1, it is characterized in that described slot number is set according to processing work, quantity is always 3 multiple.