CN102049711A - Method for grinding large-weight mill roll by holding of static pressure bracket - Google Patents

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

A kind of method of using the big weight roll of static pressure carriage holding grinding

Technical field

The invention belongs to field of machining, relate in particular to a kind of method of on light-duty grinding machine, using the big weight roll of static pressure carriage holding grinding.

Background technology

Main center hole location and the carriage locate mode of adopting in general roll dressing location, the center hole location is mainly used in the less roll of grinding weight on the light-duty grinding machine, the carriage location is used for the bigger roll dressing of weight, when roll weight is excessive, need powerful spindle motor to drive, otherwise can't realize the gyration and the grinding action of roll, when the machine motor underpower, but when the bearing capacity of bed piece is enough, the general static pressure carriage that uses carries out the holding location, with the power of reducing friction, realize the gyration of roll, thereby realize normal grinding work, but require the holding position that very high precision is arranged when being to use the static pressure carriage, circularity will be below 0.01mm, cylindricity requires below the 0.015mm, the tolerance 0.02mm at holding position, below the surface roughness Ra 0.8 μ m, otherwise will cause grinding to carry out or grinding accuracy does not reach the drawing requirement, but actual conditions are, such precision can't reach (roll lathe can realize circularity be 0.05mm) on lathe, can only be undertaken to move after the grinding by grinding machine, so just produced contradiction, if grinding machine can carry out grinding and carry out holding with regard to unnecessary employing static pressure carriage and located, that is to say the machining accuracy of static pressure carriage on after finishing roll turning, can't reaching, can not use static pressure carriage holding roll to carry out grinding, so big weight roll generally all can not grinding on light-duty grinding machine, in roll is produced, for some unconventional big weight rolls, quantity is few, it is obviously unrealistic specially to acquire a heavy grinding machine, and consideration if can utilize existing light-duty grinding machine to carry out grinding, more is of practical significance.

The static pressure carriage generally is mainly used in steel rolling mill now, and the roll pins having that steel rolling mill adopts the grinding of static pressure carriage holding polishing roll to finish carries out grinding again to the body of roll that weares and teares, and repairs the surface accuracy of the body of roll.

Summary of the invention

The purpose of this invention is to provide a kind of method of using the big weight roll of static pressure carriage holding grinding, on light-duty grinding machine, realize the grinding action of big weight roll, cut down the consumption of energy, shorten the heavy Roller Machining duration.

For solving the problems of the technologies described above, technical scheme of the present invention is:

A kind of method of using the big weight roll of static pressure carriage holding grinding is characterized in that, adopts static pressure carriage holding mode on light-duty grinding machine, once finishes all surface grinding of big weight roll, and its operating procedure is described below:

1) facing-up static pressure holder watt, manufactured size and the identical standard axle of polishing roll holding place axle journal carry out scraping with static pressure holder watt assembly, require scraping contact-making surface 80～98%;

2) breaker roll carries out finish turning and polishing, control circularity 0.03-0.1mm, and the reservation grinding allowance is 0.045～0.4mm, roughness of polished is less than Ra3.2 μ m;

3) roll is installed on grinding machine and the static pressure carriage and carries out centering, requiring axiality is 0～0.1mm, the static pressure oil pressure be roll weight 0.9-1.1 doubly;

4) grinding is carried out until finished size in breaker roll holding position, grinding and feeding amount 0.001-0.005mm, rotating speed 8-20 rev/min;

5) other surfaces that need grinding of grinding are until finished size, grinding and feeding amount 0.005-0.015mm, rotating speed 8-20 rev/min.

Compared with prior art, the invention has the beneficial effects as follows: the present invention utilizes the big weight roll of existing equipment grinding, reduces the fund input to big lathe, also reduced the power output of main motor, cut down the consumption of energy, shortened the manufacturing process and the production cycle of heavy roll, improved production efficiency.

Description of drawings

Fig. 1 is an embodiment of the invention structural representation;

Fig. 2 is static pressure carriage and static pressure holder tile structure schematic diagram.

The specific embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present invention is described further:

See Fig. 1, Fig. 2, a kind of method of using the big weight roll of static pressure carriage holding grinding after adopting 6 holdings of static pressure carriage on the light-duty grinding machine 1, is once finished all surface grinding of big weight roll 4, and its operating procedure is described below:

1) holder of facing-up static pressure watts 10, manufactured size and the identical standard axle of polishing roll 4 holding place axle journals, carry out scraping with static pressure holder watt 10 assembly, require the scraping contact-making surface to reach 80～98%, standard axle should possess lightweight characteristics, unloads on helping repeatedly, and size and polishing roll are should place's axle journal identical, require the scraping contact-making surface to reach more than 80%, help improving the oil sealing effect.

2) breaker roll 4 carries out finish turning and polishing, control circularity 0.03-0.1mm, and the reservation grinding allowance is 0.045～0.4mm, roughness of polished is less than Ra3.2 μ m.Carry out the finish turning operation, require circularity to guarantee between 0.03-0.1mm, make each position need the surface of grinding to reserve a certain amount of grinding allowance, except that the surplus at static pressure holder watt holding position be the lathe circularity 1.5-4 that can reach doubly about, the surplus at all the other positions can suitably strengthen, and helps guaranteeing grinding accuracy.Also to carry out polishing to static pressure carriage holding surface, roughness of polished reaches below the Ra3.2 μ m, because the polishing of grain roll properties of materials is difficult to reach below the Ra0.8 μ m, if be polished to the processing cost straight line is risen, to influence the oil sealing effect if roughness is too coarse, reduce the service life of static pressure holder watt simultaneously.

3) roll 4 is installed on grinding machine 1 and the static pressure carriage 6 and carries out centering, requiring axiality is 0～0.1mm, the static pressure oil pressure be roll weight 0.9-1.1 doubly.Spacing and roll length according to roll 4 holding positions are carried out the position adjustment to static pressure carriage 6.Roll 4 spindle noses one end is connected with pusher dog 3 with grinding machine 1 driver chuck 2, the other end and 5 top being connected of tailstock, static pressure carriage 6 is arranged on the machine tool guideway 7,6 on roll 4 axle journals and static pressure carriage are provided with static pressure holder watts 10, static pressure holder watts 10 is connected with Hydraulic Station control valve 9 by oil pipe 8, and the static pressure oil pressure is regulated with Hydraulic Station control valve 9, and pressure is crossed senior general and made roll 4 levitating on static pressure carriage 6, be unfavorable for that grinding can cause leaking in a large number of hydraulic oil simultaneously, causes waste; Pressure is crossed the young pathbreaker can not produce enough buoyancy, and roll 4 can not be realized normal gyration, and grinding can't normally be carried out.To formulate waterproof measure according to the roll 4 and the actual contact position of static pressure carriage 6 in an embodiment, avoid in grinding process cooling fluid mixed, cause cooling fluid, hydraulic oil premature failure with the hydraulic pressure oil phase.

4) grinding is carried out until finished size in breaker roll 4 holding positions, grinding and feeding amount 0.001-0.005mm, rotating speed 8-20 rev/min.Grinding is carried out at breaker roll holding position, each stock removal will be controlled in certain scope, and this scope is to be advisable between the 0.001-0.005mm, and stock removal is crossed senior general and caused roll " cutter relieving " phenomenon, make roll the grinding defective occur, stock removal is crossed the young pathbreaker can't improve working (machining) efficiency.

5) other roll 4 surfaces that need grinding of grinding are until finished size, grinding and feeding amount 0.005-0.015mm, rotating speed rev/min.Other need the surface of grinding according to the process sequence grinding.

Claims (1)

1. a method of using the big weight roll of static pressure carriage holding grinding is characterized in that, adopts static pressure carriage holding mode on light-duty grinding machine, once finishes all surface grinding of big weight roll, and its operating procedure is described below:

1) facing-up static pressure holder watt, manufactured size and the identical standard axle of polishing roll holding place axle journal carry out scraping with static pressure holder watt assembly, require scraping contact-making surface 80～98%;

2) breaker roll carries out finish turning and polishing, control circularity 0.03-0.1mm, and the reservation grinding allowance is 0.045～0.4mm, roughness of polished is less than Ra3.2 μ m;

3) roll is installed on grinding machine and the static pressure carriage and carries out centering, requiring axiality is 0～0.1mm, the static pressure oil pressure be roll weight 0.9-1.1 doubly;

4) grinding is carried out until finished size in breaker roll holding position, grinding and feeding amount 0.001-0.005mm, rotating speed 8-20 rev/min;

5) other surfaces that need grinding of grinding are until finished size, grinding and feeding amount 0.005-0.015mm, rotating speed 8-20 rev/min.

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