SU1502152A1 - Tool for taper-cross rolling of billets from difficultly-deformed materials - Google Patents

Abstract

The invention relates to the processing of metals by pressure. The purpose of the invention is to improve the quality of products. The heated billet is placed on the base of the 2 plates. The billet rolling process begins with the movement of the plates. The main work on shaping the workpiece is made by the inclined surfaces of the rolling parts 1. After that, the workpiece is calibrated by pre-calibration surfaces and final calibration surfaces 4. Final calibration surfaces 4 are underestimated in height relative to the pre-calibration surface by a distance equal to T = [(H- 2H) / 4] 0.015-0.003, where H is the distance between the bases of the wedges, mm

H - wedge height, mm. The surface of the final calibration 4 is made with a width selected from the relation B = (1-1.5) ϕ ^. [H-2 (H + T)] / 2.SINβ, where the β-angle of the wedge is sharpened, is pleased.

T is the distance between the preliminary and final calibrating surfaces, mm. The design of the tool allows improving the quality of products by increasing the accuracy of the diametrical dimensions due to additional running of the workpiece and reducing the level of tensile stresses on the axis of the workpiece. 1 hp f-ly, 2 ill.

Description

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The invention relates to the processing of metals by pressure and can be used in the manufacture of articles such as stepped shafts.

The purpose of the invention is to improve the quality of products by increasing the accuracy of the diametrical dimensions by reducing the level of tensile stress on the axis of the workpiece.

FIG. 1 shows the bottom half of the tool, top view; in fig. 2 is a section A-A in FIG. one.

The tool for cross-wedge rolling billets of hard-to-deform materials contains a rolling part 1 with a side inclined surface and pre-calibration surface 3 parallel to the base 2 and underestimated in height relative to the preliminary calibration surface 3 final calibration.

Surface 4 of the final calibration is lowered in height (); carry; 1no the surface 3 of the preliminary calibration by the distance expressed by

, I -2 /,

/ () 0.0015 ... 0.003,

It rubs in the foam-forming state, which eliminates the formation of loose soil on the axis and contributes to an increase in the dimensional accuracy of the product shape due to the additional running-in of the workpiece.

An example of a tool for rolling a workpiece on a piece of steel R6M5.

Baseline: wedge sharpening angle S °; rolling temperature 1000 ° C; diameter of rolled rod 20 mm; maximum elastic stress of 20 kg / mm; distance between the bases of the wedges 90 mm; wedge height 35 mm.

Then the elastic deformation of the rod

, 0.0028, and the distance is under 9 45

SRI. . 0, .144 mm. Width

the final calibration plan, taking into account the magnitude of the

(B (1 ... 1.5), 5-3,14X

25 | 90 -2 (35-fO, 014)

0, 5 mm

where H is the distance between the depths of cl. lines, mm;

h is the height of the wedge, mm.

In this case, the surface 4 of the final calibration is made with a width;

L11 CN I W -2 (,.,

B (1 ... 1.5) l |; -: - 1 -s / np,

where fi is the wedge angle, glad .;

/ is the distance between the preliminary and final calibrating surfaces, mm.

At the base

I’m waiting for the first two p and tel no

calibrating surfaces 3 are made release 5. The side inclined surfaces roll 1) of the first part 1, the surface 3 of the preliminary calibration and the surface 4 of the final calibration are made in the form of a wedge 6. In this case, the wedge 6 and the base 2 are made on the plate 7. The plate 8 is similarly made.

The shaping and calibration of the products by the instrument is carried out as follows.

The heated billet 9 is placed between plates 7 and 8. Moving plates 7 and 8 relative to each other, k, lin 6, embedded in billet 9, causing it to hinder, form it to its final dimensions. The main work on shaping is made by the inclined surfaces of the rolling parts 1. Then, the workpiece 9 is calibrated with the pre-calibration parameters 3 and the final calibration surfaces 4. At the same time, on the surfaces 4 of the final Kalnb K111ki, the product is ki.: Ib

The proposed tool for cross-wedge rolling of workpieces from hard-to-deform materials improves the quality of rolled products, which is confirmed by cutting: 1 test of experimental testing.

0

Rolled batch of blanks in quantities of 50 pcs. from steels 18X2H4MA, 11.1X15, HVG, heated to those 1ra- 5 1 l ry of rolling, with a diameter of 20 mm to a diameter of 15 mm on the known and proposed tools.

The results of measurements are summarized in the table.

As can be seen from the table, the accuracy of the rolled surfaces increased by 2 square meters from 14 to 12, and the microporosity decreased by 3 points for the 18Х2Н4МА steels and completely disappeared in steel Р6М5 and ХВГ.

The invention improves the quality of products by improving the accuracy

diametral dimensions by reducing

level of tensile stresses on the axis

blanks.

Claims (2)

1. A tool for cross-wedge rolling of workpieces from hard-to-deform materials, containing wedges located on the bases, having a spike angle, a rolling part with a lateral five-sided surface, extending parallel to the base of the preliminary calibration surface and displaced in height along the surface final calibration surface, characterized in that, in order to improve the quality of products by preventing the formation of defects in discontinuities and increasing the accuracy of diametrical dimensions by reducing the level of tensile stresses on the axis of the workpiece, the final calibration surface is lowered relative to the surface of the preliminary calibration by distance equal to / (+ 2) 0.0015 ... O, 003, When marking. The microporosity of steels is determined on non-etched sections with an increase of 100 times according to GOST 801-78. -40 where / is the distance between the preliminary and final calibrating surfaces, mm; H is the distance between the bases of the wedges, mm; h is the height of the wedge, mm. 2. The tool of claim 1, wherein the final calibration surface is made on a width equal to b (l ..., 5) + -sinf., gder- wedge sharpened angle, glad.