SU848289A1 - Roll grinding method - Google Patents

Description

(54) ROLLING POLISHING METHOD

one

The invention relates to the surface treatment of rolls before rolling and can be used in factories producing and operating sheet rolling rolls.

Methods are known for grinding rolls in which the roll is heated before grinding, then processed in a heated state, moving the grinding wheel along the roll axis Ull.

A disadvantage of the known methods is the impossibility of processing rolls of complex shape.

The purpose of the invention is the expansion of technological capabilities.

This goal is achieved by the fact that the roll is divided along its length into several sections, for which, depending on the given roll profile, the heating temperature is set according to the following relationship:

t.- - Dpd where ti is the heating temperature

roll in the considered section;

° 0-Di - the difference in the diameter of the roll in the initial and

section under consideration (the initial section for convex rolls is the middle of the roll barrel, for the concave edge of the roll barrel); cL is the linear expansion coefficient of the roll material;

10 tjj - roll temperature to

heating.

Figure 1 shows the roll, a general view; FIG. 2 shows the heat of the roll in given sections; on FIG. 15, the desired roll profile obtained after grinding and at the same temperature along the length of the barrel.

Roller 1 is divided by length into zones from 1 to n, where n is the number of zones, 20 with this barrel of roll 1, it is necessary to set the temperature in sections equal to and opposite to the desired profile at the same temperature, since only under this condition it is possible to obtain specified profiling. If it is necessary to obtain a swath concave (i.e., the diameter in the middle is smaller than at the rim of the barrel), it is heated with increasing diameter. 30 in the middle by more heating in

the middle than the edge of the m. Then grind along a generatrix parallel to the axis of the roll to remove the bulges, i.e. until the same diameter at all points along the length of the roll barrel. After equalizing the temperature along the length of the barrel (as a result of natural artificial cooling). portions that have been heated more will decrease in diameter by the amount of thermal bulge. After cooling, the roller will acquire the required profile.

Thus, the proposed method allows to obtain any curved shape of the roll surface.

Claims (1)

Invention Formula The method of grinding the rolls, in which the roll is heated before grinding, and then processed in a heated state, moving the grinding wheel along the roll axis, which is Opportunities, the roll is divided into several sections along its length, for which, depending on the given roll profile, the heating temperature is set according to the following relationship: l9 ": 5ilt9Q: 5a t. about VQ.d. heating temperature Valde tj ka in this section; roll diameter difference D "-D. in the initial and considered sections (the initial section for convex rolls is the middle of the roll barrel, for the concave edge of the roll barrel); cL - linear coefficient expansion of the roll material; t, is the temperature of the roll before heating. Sources of information taken into account in the examination . USSR author's certificate 629044, cl. B 24 B 1/00, 1977.