SU738777A1 - Mandrel for holding split workpieces - Google Patents

Description

one

The invention relates to metalworking and can be used when machining the outer surface of two halves of bearing shells.

A known mandrel for fastening detachable parts, on the casing of which is mounted a supporting DISC and clamping elements made in the form of centering conical plates 1.

A disadvantage of the known mandrel is the inability to completely treat the outer surface of the blanks.

The purpose of the invention is to expand the technological capabilities of the mandrel. ; ... This goal is achieved by the fact that the mandrel provides a clamping disc and a mechanism for moving the j-jaw clamping elements, made in the form of balls, rollers, crackers and sleeves with bevelled surfaces, designed to interact on one side with balls, and on the other - JQ through crackers with rollers, with a stepped hole bored in the bottom of one of the plates, one of the steps of which is made conical and designed to interact with

balls, and the other with one of the sleeves, while the supporting disc is provided with a collar, and the plates are spring-loaded to the supporting and clamping discs.,

FIG. 1, shows the proposed mandrel in the working position, section; in fig. 2 - the same, the beginning of the clamping blanks; in fig. 3 - the same, in the decompressed position.

Claims (2)

The mandrel for machining detachable parts comprises a housing 1, the conical part of which is attached to the spindle of the machine. On the case 1; a support disk 2 with a smooth sindrax surface is installed to the size of the internal diameter of the processed workpieces with a shoulder 3 having a grooved end. In the housing 1 there is an axial through hole in which the rod 4 is moved, connected by means of pins 5 and 6 through the openings in the mandrel housing with the left 7 and right 8 bushings having oblique surfaces A and B. . The sleeve 7 outer collar is connected with the left conical plate 9 having a stepped hole with a cone B. The plate 9 by means of springs 10 placed in cups 11 of the studs 12, washers 13 and splints 14 is pressed against the supporting disk 2. Between the plate 9 and the disk 2, balls 15 are placed, in the central holes of which an endless spiral spring is threaded. On the right, on the housing 1, the clamping disk 16 having | is mounted with the possibility of axial movement. on the inner side, a grooved flange surface, which presses the blanks, against the shoulder 3 of the disk 2; The clamping disk 16 by means of the springs 17 placed in the cups 18 and the screws 19 is constantly pressed against the right pressing plate 0.. -. . . In the end grooves of the disk 16 there are located () the radial movement of crackers 21, which contact the beveled surface G with the beveled surface B of the sleeve 8 and the rollers 22, which interact with the inner end surface of the pressure plate 20 .. ..,., The screws 23 with nuts 24 serve as a support for the end face of the sleeve 8. The mandrel operates as follows. When the stem 4 moves to the right (Fig. 3), the JIUGS hinges mounted on the NBM by pins 5 and 6 of the sleeve 7 and 8. The sleeve 8, moving to the right, brings the pressure plate 16 closer to the right pressure plate 20 under the influence of the springs 17 by moving to the center mandrels of crackers 21. Sleeve 8, resting against the screws 23, moves the clamping plate 20 and the clamping disk 16 connected with it to the extreme right;:; . At the same time, the sleeve 7, moving to the right, with the beveled surface A, squeezes the balls 15 from the center of the mandrel. The latter abutting the beveled surface In the left pressure plate 9 and compressing the spring 10, retract the plate 9 to the extreme left position , carried out yy | d || Uh half the weight of the split ncuiimnV jjjjj Qg - - ------; ----,: When the stem 4 to the left, the sleeves 7 and 8 also move to the left. At the same time, the sleeve 8 of the beveled surface B through the crackers 21 transfers the movement to the left of the disk 16. And the right pressure plate springs 17 sprung to it 17. The sleeve 7, moving 13 levers, frees the balls 15 (FIG. 2), Kj under the action of the beveled On the left, the plate 9 is moved to the center of the body 1. The left plate 9 by the springs 10 is shifted to the right. The halves of the blanks are pressed by the cones of the plates 9 and 20 to the smooth cylindrical surface of the disk 2. The stem 4 with the sleeves 7 and 8 continues to move to the left. The folded surface B of the sleeve 8, abutted against the crackers 21, spreads them in the radial direction. In this case, the disk 16 abuts against the inner grooved annular surface at the end of the blanks, pressing them against the grooved bead 3 of the disk. 2. The final clamping of the workpieces along the end is carried out when the sleeve 8 reaches the disk 16 and abuts against it. Sending takes working position (Fig. 1). Thus, the workpieces are clamped at the ends, the pressure plates 9 and 20, which ensured the installation accuracy of the workpieces on the cylindrical surface, are retracted to the sides, and the external surface of the workpieces is released to hold the tool and process it. Claims of the Invention Correction of detachable parts, on the case of which a supporting disk and clamping elements are installed, made in the form of centering conical plates, which is equipped with a pressure disc and mechanism to expand the technological capabilities of the mandrel. moving the clamping elements, made by HbiM in the arrangement of balls, rollers, crackers and sleeves placed in plates with beveled surfaces, designed to interact with the balls on one side, and on the other with rollers E, in which the bottom of one of the plates wasted stepped bore. One of the steps of which is made conical and designed to interact with the ball, and the other with one of the sleeves, while the supporting disc is provided with a collar, and the plates are provided to the supporting and clamping discs. Sources of information should be taken into account during the examination 1. USSR author's certificate N 286448, cl. B 23 B 31/40, 1970. , - / / 7 №11 azig.1 Ж5ШЖ2 h, hey "M M-