SU89265A1 - The method of processing the planes of time and precise stones of minerals - Google Patents

Description

In the production of time and precise technical stones made of ruby, it is necessary to process planes with a mass quantity with an accuracy of 0.01 mm in size and flatness of up to 0.005 mm. The processing of the planes is as follows.

Workpieces made for machining planes that have an irregular square or irregular rectangle in cross-section are glued with shellac or other bonding agent on steel or cast iron blocks. The first plane of the stones pasted on the blocks is treated with an abrasive on a grinding machine. After processing the first plane, the stones are removed from the block, glued to another block with the processed plane down and the second plane is processed. Then the stones are removed and, after controlling (sorted) by size and quality, they are further processed.

However, using this method it is impossible to obtain an absolutely correct workpiece for planar parallelism and a single height dimension, therefore further processing of the stone to give it a certain geometric shape is difficult and a large percentage of rejects are obtained in all subsequent operations.

The described method of processing the planes of watch n precise stones of minerals does not have the above disadvantages. Its distinctive feature is that, in order to achieve a uniform size for the height of all the stones being processed and to achieve flatness, the stone blanks are processed not glued to the blocks, but placed in them with the possibility of free movement between the rotating grinding stone and rotating in the opposite direction and with lower angular velocity block.

FIG. 1 shows a block with stones, side view; 2 shows a perspective view of a block with stones; in fig. 3 is a perspective view of a stone processing device; in fig. 4-process of moving stones from one block to another.

№ 89265

The method is carried out as follows. Block 1, on which machining stones are placed, is a metal ring in which an insert 2 is fixed (for fine treatments with diamond microstorms — from end bakelized plywood and for coarse-cast iron). For operation, the block is adjusted on the special device (hand press) so that the protruding part of the ring above the working surface of the liner is 0.08-0.10 in height below the predetermined (required) size of the billet 3. The insert is fixed with locking screws 10 .

The billets are pre-sorted so that the difference in their height does not exceed 0.10 mm in order to avoid breaking the stones from under the block.

Stones are poured with a shovel or from a package on a tuned block in such a quantity as to cover its surface, moistened with oil or water (depending on the processing stage) and flattened so that they lie on the block in one layer.

A block / s of stone 5, ready for operation, is mounted on a grinding stone 5, pressed with a upper pinch 4 with a force of about 0.45 kg per cm, filled with abrasive and turned on the machine.

In order to move the kamia under the block, the latter is given a rotation against the course of the grinding stone 5. The direction of rotation of the block / and the grinding stone 5 is shown by arrows in FIG. 3

In order to press the block 1 against the grinding stone 5 on the insert 2 of the block there is a center slot 6, and to give it a rotational movement an eccentric offset slot 7.

The spindle, consisting of the main rod 8 and the driver 9, ends with cones coinciding with the sockets 6 and 7.

The corner speed of the upper spindle, and with it the block, is half the speed of the grinding stone.

To check the height of the stones during operation, the block is removed from the machine after a certain period of time, several stones are taken from different parts of the block and their height is measured. Stones that need to process the second plane are moved from the first block / to the second-processed plane to the liner. In the block with treated stones, the locking screws are loosened, the stones are removed using a liner above the cage, then the block with the stones is turned over and applied to the newly tuned block, the insert of which is slightly wetted with oil or water. By shifting to the side, the first block is removed, and the stones, which are held up by the projecting cage of the second block, remain on it. The second plane is processed in the same way as the first.

Subject invention

The method of processing the planes of hourly and precise mineral stones using blocks, characterized in that, in order to achieve a uniform size in all the stones being processed and to achieve a plane-parallel, stones are placed in the blocks with the possibility of free movement between the rotating grinding stone and the rotating in the opposite direction and with a lower angular velocity block.

Fig 1

FIG. 2