SU1637922A1 - Apparatus for cross rolling - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in the manufacture of cylindrical stepped articles. The purpose of the invention is to improve the quality of products, increase tool life. The tool contains three drive rolls 1,2,3, each of which is equipped with cutting blades at the end of the calibrating section. The latter are made in the form of two intersecting at a point located on the rolling axis, arcs of equal circles — front 6 and rear 7. The radius of the circles is equal to the center distance of the adjacent rolls. The centers of the circles are defined relative to

Description

The invention relates to the field of metal forming and can be used in the manufacture of cylindrical stepped products with three rollers with wedge gauges.

The aim of the invention is to improve the quality of tool life.

The drawing shows a cross wedge rolling tool.

The tool contains three drive rolls 1-3, each of which has a loading window 4, a rolling section in the form of a deforming wedge, calibrating the area and the cutting area (knives) 5. The knives are made in the form of two arcs of equal circles, front 6 and rear 7. Radius these circles are equal to the center distance of the adjacent rolls (A). The equation of circles is written using the formulas:

(Xi - A) 2 + (YI - –y Atg 30 °) 2 A2;

ABOUT)

(X2 2 + Y2 + A (sin 60 ° - - tg 30 °) 2

(2)

 A2.

The origin of the coordinates is on the roll axis. The coordinates of the centers of the circles are respectively:

for (1): Xoi at A; Yoi at Atg 30 °; for (2): X02 0; (sln60 ° ytg300).

The tool for cross-wedge rolling works as follows.

At the initial time, the rolls are turned by the loading windows 4 towards the rolling axis. After the billet is supplied, the rolls 1–3 begin to rotate synchronously, introducing deforming wedges into the billet. After the passage of the calibrating area, the part is formed, after which the cutting knife-5 comes into operation. Each of the knives cuts a sector in the workpiece, the front arc 6 of the knife begins to cut, and

the rear 7 of the adjacent knife completes the cut in this sector. Since the rear arc is partially partially along the cut end, it is made shorter compared to the front. After cutting off the end rolls, the rolls are returned to the initial position. The item is removed from them. Rolls are ready for a new cycle.

Thus, all three knives simultaneously begin cutting and at the same time finishing it, being at each instant of time of the cut in contact with the workpiece, the cutting force is distributed evenly, which ensures a high-quality cut and increased durability of the knives.

Claims (1)

The invention The tool for cross-wedge rolling, containing three drive rolls uniformly mounted around the circumference, one of which has a profile cutting knife installed at the end of the calibrating section of the working profile, characterized in that in order to improve the quality of the products and the tool durability additional cutting knives mounted on the two remaining rolls at the end of their calibrating sections, while the Kad profile of the three knives is made in the form of two arcs of circles of equal radius, The ports of which with respect to the axes of coordinates with the origin located on the axes of the corresponding rolls are determined from the ratios 0 five 0 five one xoi -j-A: Y01 at Atg 30 °; Ho2 0; Yo2 A (sin 60 ° at tg 30 ° ) where is Xoi; Yoi - coordinates of the center of the first circle, Ho2. Yo2 - coordinates of the center of the second circle: A is the distance between the axes of the adjacent rolls, and the intersection point of the three knives is located on the rolling axis.