CN2564289Y

CN2564289Y - Automatic centring mandrel

Info

Publication number: CN2564289Y
Application number: CN 02253022
Authority: CN
Inventors: 杨海波; 张德芳; 葛群利
Original assignee: Harbin Aircraft Industry Group Co Ltd
Current assignee: Harbin Aircraft Industry Group Co Ltd
Priority date: 2002-09-06
Filing date: 2002-09-06
Publication date: 2003-08-06
Anticipated expiration: 2012-09-06

Abstract

The utility model relates to a discontinuous irregular tubular double-expansion automatic center-positioning core shaft used for the external circle processing by the internal hole positioning. The utility model is composed of a shaft body, large and small expansion sleeves, large and small fixing sleeves, large and small nuts, steel balls, a fixing sleeve, a stop nut, a locking nut and a fixing pin. As the utility model adopts the large and the small expansion sleeves, the processed parts and the shaft body can be firmly pressed. As the two expansion sleeves can be once formed through grinding on the shaft body, the high coaxiality of the two expansion sleeves can be ensured, and as the two expansion sleeves and the parts are firmly pressed, no matching gap exists. The fixing pin on the shaft body exerts the function of angular orientation positioning, which guarantees the fixing precision of the parts. The arranging of the fixing sleeve and the positioning sleeve effectively controls the expansion and extraction quantity of the expansion sleeves. According to the relation between the internal hole and the external circle of the processed parts, the two central holes respectively arranged at both ends of the shaft body can be freely arranged so as to further improve the processing precision of the processed parts.

Description

The self-centering axle

Technical field: the utility model relates to a kind of two formula self-centering axles that rise that are applicable to discontinuous, the irregular class tube shape component of endoporus location processing excircles.

Background technology: in various plant equipment, rolling stock, much discontinuous, irregular class tube shape component is arranged, these parts are all very high to the required precision of its endoporus and profile, especially shape and the position accuracy demand to its cylindrical is very high, the method that is adopted in mechanical processing process has multiple, wherein a kind of is after processing endoporus, does one and the corresponding axle of endoporus, locatees processing excircles with endoporus.This axle only is a simple and easy barred body, and its machining accuracy is not high, and applicable scope is little, for its crudy instability of large batch of processing parts, need process different axles for the part of different-diameter endoporus, makes processing cost improve greatly.

Summary of the invention: the purpose of this utility model is, provides that a kind of scope of application is wide, simple in structure, steady quality, two formula self-centering axles that rise that positioning accuracy is high.Its technical solution is, axis body is the barred body of diameter combination more than, be divided into nine joints, the diameter of every joint has nothing in common with each other, variant diameter is the different degree of eccentricity, respectively there are two centre bores at two ends, wherein the cylindrical of a nodal axisn body is a conical surface, in circle be one correspondingly the conical surface rise sharply condom thereon, the endoporus of big ringfeder is the big open endoporus in little two ends, a centre, has steel bead groove on the endoporus of the other end of ringfeder greatly, groove is embedded with steel ball, by steel ball big ringfeder and big fixed cover are joined, big fixed cover is connected with axis body with screw thread, is fixed by big nut; Alignment pin is set on the axis body; The other end of axis body is with the positioning sleeve that cylindrical is the conical surface, its endoporus is the little ringfeder with the identical tapering of positioning sleeve cylindrical tapering, little ringfeder and positioning sleeve socket-connect, the other end of little ringfeder joins by bearing and little fixed cover, terminal by primary nut locking, retainer nut and locking nut are placed in the other end of positioning sleeve.Because the utility model has adopted large and small ringfeder, make part to be processed and axis body obtain pressing closely, again since two ringfeders can be on axis body grinding-shaping once, therefore guarantee that its axiality is quite high, add two ringfeders and be and the tight pressing of part, thereby do not have fit clearance, so, its positioning accuracy for part just can be similar to the accuracy of manufacture of thinking axis body, and the alignment pin on the axis body has played the effect of angle location, has further guaranteed the positioning accuracy of part; The rising of ringfeder, the amount of contracting have been controlled in the setting of positioning sleeve and fixed cover effectively, and it is realized guiding accurately; According to the relation of the endoporus and the cylindrical of part to be processed, can arbitrarily set two centre bores that the axis body two ends are provided with respectively, thereby further improve the machining accuracy of part to be processed; The utility model is simple in structure, and is easy to use, makes the constant product quality of batch machining, the product percent of pass height.

Description of drawings:

Fig. 1 is the utility model overall structure schematic diagram;

Fig. 2 is the utility model axis body schematic diagram;

Fig. 3 is the utility model ringfeder (large and small) schematic diagram;

Fig. 4 is the utility model fixed cover schematic diagram;

Fig. 5 is the utility model positioning sleeve schematic diagram.

The specific embodiment: axis body 1 is the more piece barred body of large and small different-diameter, respectively there are two centre bores at the two ends of axis body 1, the butt end of the axis body 1 wherein outer surface of a joint is a conical surface, the endoporus of big ringfeder 2 is the identical with it conical surface, and an end of big ringfeder 2 is provided with steel bead groove, and its steel bead groove is embedded with steel ball 3, big fixed cover 4 is by steel ball 3 and big ringfeder 2 sockets, big fixed cover 4 endoporus are screw-like, are screwed on the axis body 1 corresponding position, connect big nut 5 thereafter; The other end of axis body 1 is not having to overlap positioning sleeve 9 on the joint of screw thread, the cylindrical of positioning sleeve 9 is a conical surface, the endoporus of little ringfeder 8 also is the conical surface and identical with positioning sleeve 9 cylindrical taperings, little ringfeder 8 is enclosed within on the positioning sleeve 9, the other end of little ringfeder 8 is provided with steel bead groove, its steel bead groove is embedded with steel ball 3, little fixed cover 7 is by steel ball 3 and little ringfeder 8 sockets, and be spun on the axis body 1 on the corresponding position with screw thread, terminal by primary nut 6 lockings, positioning sleeve 9 terminations are by retainer nut's 10 stop, and locking nut 11 is used for the clamping part to be processed.

When processing parts, before part to be processed installed on the axle 1, two ringfeders 2 and 8 on the axis body 1 were in free state, not with two conical surface pressings of axis body 1 and positioning sleeve 9; After part to be processed was loaded onto, rotational fixation cover 4 and 7 made ringfeder 2 and 8 risings, be supported between part to be processed and the axis body 1, make the endoporus and the axis body 1 tight pressing of part to be processed,, reach the purpose that part is positioned and clamps with this by the push-and-pull of fixed cover 4 and 7.Alignment pin 12 on the axis body is effects that the concrete shape (as endoporus and cylindrical decentraction) according to part to be processed plays the angle location.

Claims

1 one kinds of self-centering axles, it is characterized in that, axis body is a barred body by the different-diameter combination, respectively there are two centre bores at two ends, wherein the cylindrical of a nodal axisn body is a conical surface, interior circle be one correspondingly the conical surface rise sharply condom thereon, the other end of big ringfeder joins by steel ball and big fixed cover, big fixed cover is connected with axis body with screw thread, is fixed by big nut; Alignment pin is set on the axis body; The other end of axis body is with the positioning sleeve that cylindrical is the conical surface, its endoporus is the little ringfeder with the identical tapering of positioning sleeve cylindrical tapering, little ringfeder and positioning sleeve socket-connect, the other end of little ringfeder joins by steel ball and little fixed cover, terminal by primary nut locking, retainer nut and locking nut are placed in the other end of positioning sleeve.

2 self-centering axles according to claim 1 is characterized in that, the endoporus of large and small ringfeder is middle little, the open endoporus that two ends are big.