SU1555031A1 - Method of determining deformability of ingots in broaching - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used to determine the deformability of ingots from steels and alloys that are prone to the formation of internal defects, with subsequent optimization of the deformation modes. The purpose of the invention is to improve the accuracy and simplify the determination of the accumulated by the time of deformation deformation. The deformability of the ingot is determined on a sample cut from a model ingot. On the ends of the sample in its axial zone, annular risks are introduced with a diameter equal to the diameter of the zone of ingot looseness and a depth equal to half the maximum size of a single discontinuity. The sample prepared in this way is deformed in a heated state until the axial zone is destroyed. The final dimensions of the risks are fixed and the final deformation of the axial zone is determined, followed by calculating the magnitude of the accumulated deformation at the time of destruction using known dependencies. Such a method for determining the deformability of the ingots during stretching improves its accuracy. 1 hp f-ly, 1 ill.

Description

The invention relates to the processing of metals by pressure and can be used to determine the deformability of ingots from steels and alloys that are prone to the formation of internal defects, with subsequent optimization of the deformation modes.

The purpose of the invention is to improve the accuracy of determining the deformability of ingots and simplify the determination of the accumulated deformation at the time of destruction.

The drawing shows a sample for determining the deformability of the ingots.

The method is carried out as follows.

The cylindrical sample 1 heated to the treatment temperature is placed between the press or hammer strikers and is formed.

The sample is made with ring-shaped 3, applied in the axial zone 2, has shrinkage looseness 4, limited by ring-shaped 3, the diameter of which dp is equal to the diameter of the looseness zone 4 ingot, and the depth of Ar is half the maximum size of the unit discontinuity b , 5, which ensures deformation under conditions of a flat-stressed state. The deformation of the sample is carried out before the destruction of its axial zone.

The destruction is fixed visually by the appearance of the first crack in the axial zone. After that, shaping is stopped. The sample is cooled and the final dimensions of the area bounded by the deformed ring-shaped are measured. These measurements serve as the basis for calculating the final deformation of the axial zone X using known formulas. Then, knowing the angle

cl

about with

sample rates are calculated using XP formula

H

A. (l + -gflo) accumulated by the time

Allowing the deformation of the axial zone By setting the value of X, n, it is possible to estimate any forging mode with the same scheme of applying external forces and select the optimal one with the condition Ya. A, m (where I am the accumulated deformation in this mode of the axial zone)

The accuracy of determining the NR value is greatly influenced by the design of the model sample. If the sample is prepared to be solid, as in the well-known solution, the data on Hm will be overestimated. At the same time, making a sample with shrinkage loosened by a ring-shaped rim whose diameter is equal to the diameter of the zone of looseness of the ingot and a depth of half the maximum size of the single discontinuity of the looseness will allow to get a more accurate value of A, p, since the design described

Simplification of the technology for determining the accumulated deformation of the axial zone by the time of destruction consists in fixing only the final dimensions of the deformed axial zone 2, limited by the risk, and I, | determined from the dependency described above, which takes into account the intermediate shaping of the axial zone 2, associated with the turning angles

Example The deformability of OX18H5G12BA steel ingots is determined on samples cut from the sub-profit part of a model ingot and with risks placed on the ends of the samples. The samples heated to 1100-950 ° C are deformed into combined strikers with a cut angle of 90 ° with a rake of 1.7-1 , 73 and in flat strikes at

Row 1.2-1.25. Guaranteed fracture is observed during crimping and corners. Forging with a reduction of less than 2% delays the process so that the temperature of the sample falls below the allowable

processing boundaries and degradation data are distorted. The same effect occurs when turning on an angle of less than 5 °. After the samples are compressed, the final dimensions of the risks are fixed and the final deformation of the axial zone is determined from them with the subsequent calculation of the amount of accumulated deformation of this zone at the time of destruction.

Claims (1)

Invention Formula 1 Method of determining the deformability of ingots during drawing, including crimping and turning of a cylindrical sample until its axial zone is destroyed and calculating the amount accumulated by the time of deformation of the deformation sample, characterized in that, In this case, a cylindrical specimen is cut out of the ingot zone, which has shrinkage looseness, and on its end surfaces in the axial zone, annular risks with a diameter equal to meter of looseness zone, and a depth equal to half the maximum size of a single discontinuity of looseness, and after the axial zone of the sample is destroyed as a result of its reduction, the final dimensions of the risks are fixed and the value of the axial strain zone accumulated by the time of destruction is fixed 2. A method according to claim 1, characterized in that the amount of sample reduction is 2-3%, and the angle of turning is 5-15 °.