SU77637A1 - Instrument for determining the surface strength of cores for foundry - Google Patents

Description

An apparatus is proposed for determining,; 1, the surface strength of cores for a foundry. Unlike the known prefabs of the same designation, in the proposed device, the surface strength of the rod is determined by the amount of force spent by the cutter of the device for removing the surface layer from the test rod sample. The depth of insertion of the milling cutter og) is rotated by the rollers, mounted on the same axis as the mill. The cutting force is transmitted from the cutter to the spring dynamometer, recording the force, through a string attached to the cutter.

FIG. 1 schematically shows a longitudinal section of the device; in fig. 2-view of the device in the plan.

The milling cutter / and the rollers 2 are mounted on the axis 3, the ends of which are fixed in the cheeks of the hollow body 4.

The milling cutter / is connected by a string 5 with a rod 6 of a spring dynamometer and has a recess around the circumference for winding the string 5.

The rod 6 is threaded through the movable sleeve 7 and the nut 8 of the holder 9 of the dynamometer and, with its limiting protrusion 14, rests on the end surface of the sleeve 7. The nut 8 is designed to regulate the tension of the spring 10 of the dynamometer. Clip I have two longitudinal grooves, one end (from the side of the nut; 8} screwed into the cnj c 4.

The surface strength tests are carried out as follows.

The cutter / put together with the rollers 2, limiting the depth of its cutting, on the test specimen of the rod and, slightly pressing on the body 4, roll the cutter over the sample.

The string 5, winding on the milling cutter 1, doesn’t follow the rod 6 with the movable sleeve 7, which compresses 10.

At the moment when the compressive force of the spring 10 is balanced by the force required to remove the surface layer, the milling cutter / stops rotating and only slides over the sample, removing the surface layer from it.

The forces applied to the mill to remove the layer, which determine the surface strength of the sample, are determined by the graduated gauge 11 of the dynamometer applied to the holder 9.

The pointer of the chalcats // serves as the front edge of the spring ring 12, worn on the shoe 555

9. The ring moves along the scale with the help of two screws 13, screwed into the movable sleeve 7. When moving the screws along with the sleeve along the sleeve, their outer ends inserted into the grooves of the sleeve I are pressed against the ring and pull it behind them.

The subject of the invention is a device for determining the surface strength of cores for foundry production, characterized in that, in order to determine the surface strength by the magnitude of the force applied to remove the surface layer, it is made in the form of a cutter that cut the layer of the cutter 2 mounted on axis 3 rotatably, and string 5 connecting the milling cutter with a spring dynamometer attached to the body of the device for recording forces applied to the milling cutter.

50 ISO 307 W 10 s-1. I. | U.II-I-1-