JPS59101210A - Grinding method of rolling roll - Google Patents

Abstract

PURPOSE:To perform continuously and adequately a grinding operation while preventing the chipping of a grindstone in the stage of grinding a rolling roll by bringing the grindstone into press contact with the roll only when the grindstone moves in the direction where the grindstones emerges from a grindstone holder. CONSTITUTION:A grindstone 1 is brought into press contact with the surface of a rotating roll 2 under a prescribed force F, and while the grindstone 1 is moved back and forth in the direction parallel with the roll shaft and in a vertical direction, whereby the roll is ground. Since there is a slight space between a grindstone holder 3 and the grindstone 1, an inclined space DELTAS is formed, and contact points 5, 6 where the grindstone 1 is strongly pressed are created. The grindstone 1 is affected by the force P larger in the stage of moving from (b) to (a) than in the stage of moving from (a) to (b) by the difference in the direction of the sliding resistance at the points 5, 6. The grinding is thus performed under exertion of a press contact force F on the grindstone 1 only when said stone moves from (a) to (b) and the grindstone is returned without exertion of the force F in the backward way returning from (b) to (a), whereby the failure of the grindstone 1 is decreased.

Description

[Detailed description of the invention] The present invention relates to a method for grinding a mill roll.

The present applicant has published Japanese Patent Application Laid-Open No. 56-14010 (% Application No. 54-888) as a rolling roll grinding method and apparatus therefor.
No. 02) and Japanese Utility Model Application No. 1983-28945, etc., but at the stage of implementing these proposals, new technical difficulties were encountered that needed to be solved.

In other words, the above proposal solved the phenomenon of clogging of the grinding wheel during roll grinding, and also solved the problem of grinding wheel damage due to vibration of the work roll during rolling material biting and ash removal. Breakage of the grindstone occurs at times other than when removing ash.

The present invention was arrived at at the stage of searching and investigating the cause of this problem.

Diagonal oscillation grinding is performed by reciprocating diagonally up and down while pressing the grindstone against a rotating roll (Japanese Patent Laid-Open No. 56-14010
No.), it is necessary to allow the whetstone to move slightly in and out of the whetstone holder. This is because the At1 body to be ground is cylindrical, and the grindstone moves in a straight line, so if you try to grind a predetermined length by following the surface of the cylinder, you will inevitably have to move the grindstone in and out of the holder. Because you need it.

This causes friction due to sliding between the grindstone and the holder. The sliding resistance due to this friction acts on the grinding wheel in the opposite direction when it leaves the hono C holder and when it enters (returns) into the holder, and in the former case it acts in the direction of canceling out the back pressure on the grinding wheel. , the latter acts in the same direction as the back pressure. For this reason, the pressing force of the grindstone against the roll is large, and therefore the bending compressive force is large, making it easy for chips to occur.

To explain this with reference to the drawings, as shown in FIG. 1, the grinding wheel 1 is pressed against the surface of a roll 26 rotating in the direction of the arrow at a predetermined angle. In oblique oscillation grinding, this grindstone 1 is obliquely oscillated from position a to position b in the figure, and then
Grinding is performed as shown by diagonal lines in the figure. In addition, the broken line in FIG. 2 shows the grinding locus of a plurality of parallel grindstones, and in FIGS. 1 and 2, 3 is a grindstone holder that holds the grindstone, and 4 indicates the width of each grindstone.

The force P applied to the grindstone during rocking is as shown in FIG. That is, when moving from position a to b, the force P applied to the grindstone is slightly small, and conversely, when moving from position b to a, it becomes large.

As shown in FIG. 4, the grindstone 1 is pressed into the holder 3 by a predetermined force F in the direction of the arrow. Since there is a small gap between the grinding wheel holder 3 and the grinding wheel 1, the grinding wheel 1 is tilted as shown in the figure due to bending moment, and a gap ΔS is formed, and at the same time the grinding wheel 1 is strongly pressed inside the holder at the contact point 5. and 6 can be done. When the grindstone 1 moves from position ka to position b, the shaft 9 is also positioned, so that the reason why the grindstone receives a large force P when it moves aVC is considered to be due to the difference in the direction of the sliding resistance holes at the contacts 5 and 6.

In other words, the sword applied to the whetstone is a force (F
+R) is the pressure contact force P that the grindstone 1 actually receives. Therefore, conversely, when the grinding wheel 1 moves from position a to position b, the sliding resistance R acts in the opposite direction to the pressure contact force, so the force actually applied to the grindstone is (F - 几), and the pressure contact force P is It becomes smaller.

The present invention was developed based on the findings obtained through detailed investigation of the behavior of the rotating rolling roll, which is the object to be ground, the pressure grinding wheel, and the grinding wheel in the holder, as described above. When grinding by diagonal rocking, in which the grindstone is pressed against the surface of the rolling roll and reciprocated in a direction parallel to the roll axis and also reciprocated in the vertical direction, The purpose is to grind the rolling roll by pressing the grinding wheel against the rolling roll only when the grinding wheel is moving.

In the present invention, grinding is performed by applying pressure force F only when the grindstone 1 moves from position a to position b in the diagonal swing as described above, and the pressure contact force F is applied during the outward movement from position a to position a. Simply return it to position a without applying it. Therefore, it is extremely unlikely that the excessive force P of the grindstone will act and damage the grindstone. Further, in the contacts 5 and 6, the greatest sliding resistance occurs on the return path, which leads to wear or damage, which can be prevented.

According to the present invention, the actual grinding time is halved compared to reciprocating grinding, since there is no chipping of the grinding wheel, and the frequency of replacing the grinding wheel is reduced, which reduces the number of work interruptions and is advantageous for continuous work. You can get results.

In addition, the efficiency decrease due to the actual grinding time being halved is as follows:
It is possible to compensate for this by using a grindstone with greater grinding power.

As a result of implementing the present invention, in reciprocating grinding, defects occurred approximately 8 times per 100 minutes of total grinding time, but now
The number of defects was approximately once every 80 minutes.The material of the grindstone used at that time was GO120H (JIS), and the grinding roll was a high alloy grain roll.

[Brief explanation of drawings]

Figure 1 is a side view to explain the operation of the grindstone in diagonal oscillation grinding using grindstone pressure, Figure 2 is a view showing the trajectory of grinding, and Figure 3 is the force exerted on the grindstone in the forward and return passes. FIG. 4 is a diagram explaining the behavior of the grindstone in the holder. In the figure, 1: Grinding wheel, 2: Grinding roll, 3: Grinding wheel holder

Claims (1)

[Claims] (1) When a non-rotating grindstone is pressed against the surface of a rotating rolling roll and the grindstone is reciprocated in a direction parallel to the roll axis and simultaneously reciprocated in the vertical direction for roll grinding, the grindstone is removed from the grindstone holder. A method for grinding a roll, characterized in that the grindstone is pressed against the surface of the roll only when the grindstone moves in the direction of exit, and is not pressed when the grindstone moves in the direction of being drawn into the grindstone holder.