Method for grinding large-weight mill roll by holding of static pressure bracket

Abstract

The invention relates to a method for grinding a large-weight mill roll by the holding of a static pressure bracket on a light-weight grinder, which is characterized in that: all surfaces of the mill roll are ground in one step by the holding of the static pressure bracket on the light-weight grinder. The method comprises the following steps of: 1) performing facing-up on a static pressure support tile, so that the scraping contact surface is between 80 and 98 percent; 2) performing finish turning and polishing on the mill roll, so that the circular degree is between 0.03 and 0.1 millimeter, the margin is between 0.045 and 0.4 millimeter, and the roughness Ra is less than 3.2 micrometers; 3) installing and aligning, so that the axiality is less than or equal to 0.1 millimeter, the pressure of static pressure oil is 0.9 to 1.1 times the weight of the mill roll; 4) grinding a holding part at the rotate speed of between 8 and 20 revolutions / minute under the feed amount of between 0.001 and 0.005 millimeter; and 5) grinding other surfaces at the rotate speed of between 8 and 20 revolutions / minute under the feed amount of between 0.005 and 0.015 millimeter. The method has the advantages that: the output power of a main motor is reduced; and manufacturing process and production period of the heavy-duty mill rolls are shortened.

Description

technical field [0001] The invention belongs to the field of mechanical processing, and in particular relates to a method for grinding heavy rolls supported by a static pressure bracket on a light grinder. Background technique [0002] Generally, the positioning of roll grinding mainly adopts the top hole positioning and the bracket positioning method. The top hole positioning is mainly used for grinding rolls with small weight on light grinding machines, and the bracket positioning is used for grinding heavy rolls. When it is large, a high-power spindle motor is required to drive, otherwise the rotary motion and grinding operation of the roll cannot be realized. When the power of the machine tool motor is insufficient, but the bearing capacity of the machine bed is sufficient, the static pressure bracket is generally used for supporting and positioning , to reduce friction, realize the rotary motion of the roll, so as to realize the normal grinding work, but when using the ...

AI Technical Summary

Problems solved by technology

[0002] Generally, the positioning of roll grinding mainly adopts the top hole positioning and the bracket positioning method. The top hole positioning is mainly used for grinding rolls with small weight on light grinding machines, and the bracket positioning is used for grinding heavy rolls. When it is large, a high-power spindle motor is required to drive, otherwise the rotary motion and grinding operation of the roll cannot be realized. When the power of the machine tool motor is insufficient, but the bearing capacity of the machine bed is sufficient, the static pressure bracket is generally used for supporting and positioning , to reduce friction, realize the rotary motion of the roll, so as to realize the normal grinding work, but when using the static pressure bracket, it is required to have a high precision of the supporting part, the roundness should be below 0.01mm, and the cylindricity should be 0.015mm Below, the tolerance of the holding part is required to be 0.02mm, and the surface roughness Ra0.8μm or less, otherwise it will cause the grinding to fail or the grinding accuracy cannot meet the requirements of the drawing, but the actual situation is that such accuracy cannot be achieved on the lathe ( The roundness that can be achieved by the roll lathe is 0.05mm), and it can only be operated after being ground by the grinding machine, which creates a contradiction. If the grinding machine can be ground, it is unnecessary to use a static pressure bracket for positioning, and That is to say, after the roll turning is completed, the processing accuracy of the upper static pressure bracket cannot be achieved, and the roll can not be ground by using the static pressure bracket to support the roll, so the heavy-duty rolls generally cannot be ground on a light grinding machine. In roll production, For some unconventional large-weight rolls, the number is not large, and it is obviously unrealistic to buy a heavy-duty grinding machine. It is more practical to consider that the existing light-duty grinding machine can be used for grinding.

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