SU959878A1 - Tool for cold expansion of tubes - Google Patents

Description

(54) TOOL FOR COLD PIPES DISTRIBUTION

Claims (1)

The invention is related to machining, which is intended for machining holes in tons. and it may be a1O) due to the final processing of cylindrical pipes for hydro-pneumatic parts by the method of deformation by stretching (finishing). A known tool for dispensing pipes containing a stepped mandrel with deforming stumps pressed on it, the axle of the mandrel is bored, radial holes in the walls of the mandrel, radial grooves communicating with the holes of the mandrel on the ends of the rings. The tool is equipped with a system for supplying working fluids to the channels 1 formed by the openings and mi. Separating lubricant between the surface of the pipe and the working rings during operation of the floor. It works only with the pipe metal preheated to the temperature of deformation.The disadvantage of this tool is that, in order to prepare for operation, it requires charge of the fluid by the working fluid of the cavity and When discharging the pipe, after the end of the dispensing process, the tool heats up to a temperature above the vaporization of the working fluid, which causes certain inconveniences during operation. The hole is not very accurate with this tool. The aim of the invention is to improve the quality of the treatment. as a conventional instrument containing a hollow mandrel with deforming elements mounted on it, in the walls of which 1 radial holes are made, and deforming at the ends uyuschih zlementy facing one another, - radial grooves, as well as a source for supplying working zhndkosti formed in its apertured channels and grooves. 3.95 is equipped with a piston rod mounted in the bore of the mandrel with the possibility of axial movement of the nbFM, on the outer surface of which there is an annular point connected to the outflow cavity and one of the radial holes of the mandrel, and the stem cavity is connected to the source of working fluid as which used a lubricating fluid. The drawing shows a general view of the proposed tool section. The tool contains a frame 1, along the axis of the mandrel there is a cylindrical bore with a movable element placed in it - a hollow bollard 2 with a piston bore along with the rod. On the piston there is an annular groove b, connected to the cavity g of the rod. Radial holes are provided in the walls of the ortrav for supplying lubricating fluid to the grooves b at the ends of the deforming elements 3. A rod mounted with backward and forward movement in the cavity of the mandrel relative to the radial holes in cTeincax successively distributes the flow of lubricant to the treatment zones 3, the enlarged to the outlet diameters are planted on the daisydric part of the mandrel, tightly pressing working elements to each other and holding them and in this state is provided with a nut 4, a screw to the front of Ya1ravki. The operation of the tool can be traced to the sign of machining a hole with a diameter when pulling a load from a pipe with a hole diameter of 67 mm and a tide of 10.5 mm, the material is zirconium niobium float of the E-125 grade. Processing is carried out on a vertical press of model P-6330 with a force of 100 tf. The tool is fixed in the upper traverse of the press, the hole in the pipe is distributed to the size WV1 with a set of elements JS. outer diameters, respectively, 67.50; 68.75, 70.35; 70.55; 70.06 + 70.08 mm. When machining, the outer diameter of the pipe is increased to 90 mm. The elastic shrinkage of coctaB is 0.47 - 0.52 mm, the value of the hardened layer is 1000 - 1100 μm. When the tool E moves down when approaching the upper end of the workpiece 5, a lubricating fluid (industrial oil 20-30) flows into the stem, which is directed through the radial holes in the mandrel to the radial grooves on the ends of the first deforming element. Upon subsequent downward movement of the tool, the stem moves upwards and successively distributes the lubricant fluid to the deforming elements. During the return stroke of the tool, the rod returns to its lower initial position, the part is removed from the support sleeve and the cycle is repeated. The economic effect of using the proposed tool in the manufacture of a set of parts per apparatus is 50 thousand rubles. by reducing the allowances during final processing and replacing the operation of boring a hole for deformation drawing without removing the metal. The invention The tool for cold (pipe tasks, containing a hollow mandrel - with deformed elements fastened to it, in the walls of which radial holes are made, and at the ends of the deforming elements facing one another - radial grooves, as well as the source of working fluid for the nodach it into channels formed by holes and grooves, characterized in that, in order to improve the quality of processing, it is provided with a hollow rod with a piston mounted axially with the possibility of axial movement on the drug window The ring is equipped with an annular point, connected to the cavity of the rod and with the radial holes, and the cavity of the rod is connected to a source of working fluid, which is a lubricating fluid. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 614862, cl. B 21.D 41/02, 13.12.76 (prototype). J a