CS201099B1 - Clamping mandrel - Google Patents

Description

The object of the invention is a clamping tm for parts with a cylindrical bore which ensures accurate and concentric centering of the part and its clamping in three places around the perimeter of the bore.

The purpose of the invention is to provide a clamping mandrel for accurate centering and clamping with ease of maneuverability and low cost. For clamping cylindrical parts with a central bore, clamping mandrels of various designs are used, such as cylindrical sleeves expanded by internal cones, a tapered wedge moving axially over a conical surface, flexible sleeves expanded by fluid pressure, resilient plastics, various diaphragm assemblies and the like.

Most of these arbors did not meet the requirements for repeatable concentric clamping accuracy or required high precision manufacturing at high cost.

These drawbacks are overcome by the clamping mandrel of the present invention in that it is formed by an expanding dark body on which a guide body is mounted, in the central opening of which a screw with expanding sleeve, spacers, thrust washer and nut for operating foils are mounted. on which the centering prisms are displaceably mounted in the slots of the guide body by means of pins.

201 099

The attached drawing shows an embodiment of a clamping mandrel according to the invention; Fig. 1 is a cross-sectional view taken along line B-B in Fig. 2; Fig. 2 is a plan view taken along line A-A in Fig. 1; and Fig. 3 shows the diameter of clamping position U and insertion position V;

Through the central hole of the guide body 2, fastened by the screws 11 to the mandrel body J, the clamping screw 2 extends at the top with an enlarged diameter on which the thrust ring 10 is slidably guided and threaded (not shown) with a screwed nut g. 3® is also threaded and by means of spacers 4 and spacers 12 and a shoulder at the upper end of the clamping screw 3 is fastened in the central hole of the guide body 2. On this clamping screw 2, blades 5 in the shape of three legs are threaded between the spacers. of the flexible plates, at the ends of which the centering bars 6 are fixed by means of pins J and washers 8, which are guided axially and radially in three cutouts of the guide body 2 at 120 ° intervals.

Before sliding the workpiece or the workpiece to be inspected on the mandrel, turning the nut 2 downwards / screwing / transmits pressure via the thrust ring 10 to the upper and lower foil% connected to each other by pins J with centering bars 6. The centering bars 6, the surface of which in the form of three cylindrical sectors, have been ground to the same diameter as the hole of the clamping element, when released by the nut 2 ^ns . After inserting the workpiece / fig. 3 the position V / with unscrewing or loosening the nut 2 part * is precisely centered and firmly clamped, since the centering bars 6 perform a parallel movement while keeping the exact cylindrical diameter / fig. 3 position U /.

Worn centering fries 6 can be easily replaced by new ones or rotated by 180 ° to be worn and grind their surface by unscrewing the nut 2 ·

The clamping mandrel can be used both for mechanical machining for clamping the part directly on the machines and for clamping on control devices. The system can also be used for clamping parts by surface by suitable design variation.

Claims (1)

SUBJECT OF THE INVENTION Ζ » Clamping mandrel for components provided with a cylindrical bore, characterized in that it is formed by an expanding mandrel body (1) on which a guide body (2) is mounted, in whose central bore there is a clamping screw (3) with a spacer sleeve (12) washers (4), pressure ring (10) and nut (9) for operating the foils (5), guided on the clamping screw (3), on which they are fixed by means of pins (7) / 2 /.