SU63779A1 - Method of centering hollow articles when processing their inner surface and cartridge for carrying out the method - Google Patents

Description

When installing hollow products on a turret lathe, in order to process their inner surface, the product is usually centered by the indicator. However, the work by the indicator is very tiring for the worker, it takes a lot of his time and still does not guarantee that products are of high allowance for the difference in thickness.

The purpose of the present invention is to enable the centering of said products on the machine without the aid of an indicator. This is achieved by installing a self-centering mandrel in the turret head, on which the workpiece is placed. On the machine spindle, a chuck is installed with self-adjusting cams, in which the product is clamped, pre-mounted on the mandrel. After the article is clamped by the chuck jaws, the mandrel is removed from the article and from the turret and the tool is installed into the latter instead of the mandrel.

For the implementation of this method of centering, a cartridge is proposed in which the self-detachability of the cams is achieved

by covering the chain of Gall rollers, rotatably mounted on the backs of the chuck jaws.

In FIG. 1 shows an exemplary embodiment of a self-centering mandrel, and FIG. 2 shows the proposed cartridge for carrying out the method of centering hollow articles.

In the nest of the turret set the shank 3 self-centering mandrel, for example, on fkg. 1. On the mandrel wear product A.

When rotated clockwise to failure, handle 2, screw 1 presses wedge 4, which flicks (to the left) tgu 7, carrying crackers b, evenly pushing cams 5. One of these cams is located at one end of the product, and the other group H; I other end. The cams center the product along the axis of the machine spindle with sufficient accuracy.

A spring 8 is introduced to guarantee cam pressure 15 5, even in the case of a retreat, the configuration of the cd is from the set point.

After the product is inserted into the mandrel, it is inserted into the cartridge mounted on the spins; The cartridge clamps the product in the strictly centered position, which he attached to the mandrel.

For this purpose, it is advisable to use a cartridge with self-locking jaws, for example, in FIG. 2. This cartridge has cams 10, which are under the influence of springs 9. On the back side of cams 10 are placed rollers AND, which are covered by a chain Gall 12. The chain can be adjusted using tensioner 13. If, for example, -.) 10 will be tangled, products A earlier than others, then a further increase in pressure will not occur until the chain Gall 12, rolling over the rollers 11, brings the other cams to the touch. After that, a further uniform clamping of the product will occur.

After the product is clamped by the cams 10 of the cartridge, the handle 2 (FIG. 1) rotates the mandrel in the opposite direction and the cams 5 release the product. The mandrel is removed from the product, is built from the turret head, and instead is installed the tool that is used to machine the product.

Subject invention

Claims (2)

1. A method of centering hollow articles when processing their inner surface on a turret machine, wherein instead of a tool, a self-centering mandrel is mounted on the turret head, onto which the product is placed, and the latter is fixed in the self-aligning chuck mounted on the machine stem, then the mandrel is removed. 2. A cartridge for carrying out the method according to claim 1, characterized in that in order to achieve self-sustainability of its cams, the latter are provided on the rear sides with rollers 11, covered by a common Gall 12 chain with adjustable tension. F FIG. one