SU743758A1 - Ring article producing method - Google Patents

Description

I

The invention relates to the processing of metals by pressure, in particular to the technology for the manufacture of conical rings.

out details.

A known method of making conical ring parts by bending-rolling. The pre-cut from the sheet is subjected to continuous sequential bending by applying force perpendicular to the plane of the preform, which then forms a conical surface. Trimmed edges after weld {.

The disadvantage of this method is that when cutting a lot of metal goes to waste, and when bending in straight rollers, slippage of wicker rolls on the billet occurs, scoring on the surface of the sheet.

A known method of manufacturing conical rings involves the plastic deformation of a cylindrical billet on a conical mandrel by axial loading of the billet in the process of nagrav, holding and cooling, and the heating is carried out up to the temperature of the superplasticity material C2j.

The disadvantage of this method is that to heat the billet in 5 mode of superplasticity,

special installations with isothermal regime, usually very difficult to manufacture.

Closest to the proposed method of manufacturing conical ring parts from cylindrical ring blanks by reshaping them. A piece of pipe is taken as the cylindrical billet, or the ring billet is welded from the sheet. This way

allows you to increase the utilization of sheet metal 2 times 3J,

Claims (3)

The disadvantage of such a method of forming conical blanks ow. Significant efforts are required to obtain a cone. At present, only small rings of diameter are made by this method, for example, separations of rolling bearings. In order to form large-diameter ring blanks on high-strength mothers, large press forces and high-strength tooling are required. The purpose of the invention is the expansion of dia. paaona manufacturing products in the direction of increasing their diameter and reducing energy costs. This goal is achieved by reshaping in sections, applying bending forces along a rectilinear generatrix. FIG. Figure 1 shows the pattern of loading and shaping the annular billet in the first pass; in fig. 2 - ring shape before loading the last section, i.e., last pass; in fig. 3, 4 and 5, one of the possible stamping structures is shown, with FIG. 3 is a view A of FIG. 4, in FIG. 5 is a section BB in FIG. four; in fig. 6 - ring under load in the stamp. The method of forming the conical ring parts is that the cylindrical ring billet 1 is installed by the section t on the supports 2 and is loaded on this section by force P, directed along; straight guide. Under the action of a buckling force P, the portion of the cylindrical annular billet i bends by the value Y. The lower fibers are stretched and the length t is converted into a length L, which is greater than C. and the upper fibers are compressed and the length is reduced to /. After successive bending across the entire contour of the contour, the annular cylindrical billet becomes conic with a large diameter at the bottom and a small one at the top. Example: From a cylindrical ring billet with a diameter of 1000 m and a height of an image of a thin 1OO mm and a wall thickness of 10 mm, material X18H10T is required to make a conical ring detail with a taper angle of 15, t, e. - 986.6 mm. Initially, the deflection / is determined, which provides an increase in one and a decrease in the other diameter by 13.4 mm, i.e. S 1.34%. With the length of the formed section s 100 mm, the size of the rage s is 0.432 V 0.432 UTGZT 0.626 m Taking into account the springback for this material O, 9 mm. As one of the variants, bending is performed in a stamp that has a tangential curvature equal to the curvature of the ring preparation, and an axial curvature with a curvature arrow x. Stamp with base 100 mm. The depth in the middle of the section is 0.90 mm more than at the edges. Stamp set under the press. The shaping force is P 10 O, O tc (by a known method, a press with a force of 3,500.0 ts is required). After bending one section, it moves to the side, and a new section is fed to the shaping zone. The number of passes is equal to 5, i.e., it is intended to overlap the sections between them. After shaping by bending, the ring is then calibrated, for example by heat setting. The technique and economic efficiency of the proposed method lies in the fact that the formation is carried out on small presses with a simplified tooling. I compared the efforts required for shaping the conical ring billets according to the known distribution method (P-3500 ton-force) and using the proposed method (Pel00 ton-force), it can be assumed that economic efficiency only in the difference in the cost of the presses is 800 thousand rubles. In addition, the equipment is simplified, which by a known method is 25% of the cost of the ring, and the proposed method is 5-7%. Formula Fig. 1. A method of manufacturing conical ring parts from cylindrical ring blanks by reshaping them, characterized in that in order to expand the range of production of products towards increasing their diameter and reducing energy costs, the reshaping is carried out in sections, applying a bending force along forming the workpiece. Sources of information taken into account in the examination 1. Moshnin E. N. Bending and editing on rotary machines. M., Mechanical Engineering, 1967, p. 76-81. 2. USSR author's certificate number 433223, cl. C 21 D 9 / 4O, 1972. 3. Lvov, D.S., et al. Stamping of ring blanks, M., Mashgiz, 1957, p. 166-176.