JPS6116584B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chock-equipped roll grinding device that grinds the body of the roll by mounting the roll on the grinding device with the chock (bearing case) attached.

Conventionally, re-grinding of a roll body without a chock, as well as grinding of a chocked roll, has been carried out with the roll temperature close to room temperature. In the case of roll grinding with chock, the chock inner bearing has a diameter that is perpendicular to the roll axis at room temperature (15 to 25°C).
Creates a clearance of 0.2-0.3mm. This is because the chock inner bearing is designed and manufactured in such a way that the proper clearance is achieved only when the temperature of the inner chock bearing increases due to the heat generated by the rolling force and rotation during rolling. Conventionally, when grinding a roll with a chock, simply fixing the chock on the grinding device would cause the roll to wobble.
To avoid grinding chatter, a structure was adopted in which a steady stop was provided at both ends of the roll body, and the steady stop claws pressed the roll from the opposite side of the grindstone. However, it is difficult to measure the appropriate pressing force;
Also, the surface roughness of the ground surface where the pawl is in contact and where it is not in contact will be different, which will have a negative effect on the finished surface roughness of the rolled plate, and if the pawl is made of a material that does not affect the finished surface, the pawl will wear out. Another drawback was that the steadiness wears out quickly, and that the steady rest and its pawls become jammed when loading and unloading rolls, making it difficult to operate the crane and measure the diameter of the roll body.

The present invention has been made in view of the above-mentioned points, and allows the roll to be accurately held only by the bearing in the chock without using a steady stop, thereby enabling more stable support of the roll. Another object of the present invention is to provide a chocked roll grinding device that can increase the rotational speed of the roll during grinding to the rotational speed during rolling as required.

The following Figures 1 to 2 show one embodiment of the present invention.
The diagram will be explained. In FIG. 1, reference numeral 1 indicates a roll that is a workpiece, and reference numeral 2 indicates a chock that is fitted to journal portions 1a (see FIG. 2) at both ends of the roll 1 via bearings 3. Chiyotsuku 2
is mounted on a chock holder 6 provided on a saddle 5 which is slidably mounted on a bed 4a on the side of the workpiece, and the lower surface of the chock 2 is supported by one to eight support pieces 7. It is supported at a predetermined height and posture, and is fixed by a receiver 8 and a clamp piece 9 that sandwich the sides. 10 is a headstock for giving rotation to the roll 1, 4b is a bed on the grinding wheel side, 11 is a carriage, 12
is a whetstone head, and 13 is a whetstone. These configurations are
Since it is similar to a normal chocked roll grinding device, detailed explanation will be omitted.

In FIG. 1, 14 is a lubricating oil tank, and 15 is a pump. The discharge pipe 16 of the pump 15 is
It branches into first and second pipes 17a and 17b, joins the supply pipe 18 again, and is connected to the chock inner bearing 3 portion. Chiyotsuku 2 is
As shown in FIG.
Holes 21 provided in the outer rings 3a of the two choke inner bearings 3 arranged from 9 through the spacers 22.
It has a flow path 20 that leads into each bearing 3 via the bearing. The spacer 22 has a hole 23
The chock 2 is provided with a channel 24 communicating with the hole 23, and a joint 25 is provided at the opening of the channel 24. A return pipe 26 leading to the lubricating oil tank 14 is detachably connected to this joint 25. In addition,
The spacer 22 is configured to form an annular chamber 27 on the outer periphery of the journal portion 1a of the roll 1 with the two chock inner bearings 3, and the hole 2
The lubricating oil that has flowed into the bearing 3 from the bearing 1 flows into the annular chamber 27 and flows out from the hole 23. Further, the positions of the holes 21 and 23 are such that the lubricating oil flowing from the hole 21 does not flow out to the hole 23 in a short circuit, but flows for a longer length inside the bearing 3 and the annular chamber 27 to reach the hole 23. is determined from the relationship with the rotation direction of the roll 1.
28 is a seal.

As shown in FIG. 1, the first pipe 17a is provided with a first flow rate adjustment valve 30 and a heater 31, and the second pipe 17b is provided with a second flow rate adjustment valve 32. 33 is a temperature for setting the temperature in the vicinity of the chock inner bearing 3 when the temperature in the vicinity of the bearing 3 in the chock is increased to a value that can eliminate the wobbling of the roll 1 when the clearance of the bearing 3 is increased as described later. The setting device 34 is a first temperature detector for detecting the temperature near the inner chock bearing 3, and 35 is a second temperature detector for detecting the temperature of the lubricating oil supplied to the inner chock bearing 3. A first adder 36 generates a temperature difference signal S' between the set temperature of the temperature setter 33 and the detected temperature of the first temperature detector 34. 3
A second adder 7 adds the temperature difference signal S' to a signal based on the temperature difference between the first temperature detector 34 and the second temperature detector 35 to generate a lubricating oil temperature control signal S. It's summery. This lubricating oil temperature control signal S
is amplified by an amplifier 38 and applied to the first and second flow rate regulating valves 30 and 32, respectively, so that the opening degrees of both valves are changed in opposite directions according to the lubricating oil temperature control signal. It's summery.

Next, the operation of this device will be explained. The roll 1 with the chock 2 still attached is mounted on the chock holder 6 and fixed with the clamp piece 9, and the temperature setting device 33 is set as described above, which is determined in advance according to the type of the roll 1. Set temperature. Next, the detection end 34a of the first temperature detector 34 is attached to a temperature detection section provided near the inner bearing 3 of the choke, and the supply pipe 18 and return pipe 26 are connected to the joints 19 and 25 provided in the choke 2. , the pump 15 is operated to supply lubricating oil to the inner choke bearing 3.

A first temperature detector 34 detects the temperature near the chock inner bearing 3, while a second temperature detector 35 detects the temperature of the lubricating oil supplied to the chock inner bearing 3 via the supply pipe 18. do. First, looking only at the output signals of both temperature detectors 34 and 35, both output signals are calculated by the second adder 37, and a lubricating oil temperature control signal S corresponding to the temperature difference between the two is output. . The absolute value of this lubricating oil temperature control signal S is proportional to the temperature difference between the two,
Its sign becomes positive when the output signal of the first temperature detector 34 is higher, and becomes negative when the output signal is higher. If a positive lubricating oil temperature control signal S is now being output, the lubricating oil temperature control signal S amplified by the amplifier 38 is transmitted to the first flow rate regulating valve 3.
The opening degree of 0 is increased, and the opening degree of the second flow rate adjustment valve 32 is decreased. A heater 31 is provided on the side of the first pipe 17a equipped with the first flow rate regulating valve 30 whose opening degree increases, and the temperature of the lubricating oil passing therethrough is brought to a predetermined high temperature, while the opening degree decreases. Since there is no heater on the second pipe 17b side equipped with the second flow rate adjustment valve 32 and the temperature of the lubricating oil passing therethrough is relatively low, the supply pipe 18 The temperature of the lubricating oil that is supplied to the inner choke bearing 3 increases. In this way, the first and second temperature detectors 34, 35
When the output signals match and the lubricating oil temperature control signal S becomes zero, the first and second flow rate adjustment valves 3
Stabilize the opening of 0.32.

However, the temperature difference signal S' between the set temperature of the temperature setting device 33 and the output signal of the first temperature detector 34 is also related to the lubricating oil temperature control signal S. That is, when this temperature difference signal S' is zero, the first and second
The first and second flow rate regulating valves 30 and 32 are activated as described above only by the output signals of the temperature detectors 34 and 35.
The lubricating oil at the same temperature as the temperature near the chock inner bearing 3 is supplied into the chock inner bearing 3 by controlling the opening degree of the chock inner bearing 3 to maintain the region at a predetermined temperature. If there is a difference between the temperature difference signal S' and the set temperature, and the temperature difference signal S' is not zero, the lubricating oil temperature control signal S is obtained by adding this difference.

If the temperature near the chock inner bearing 3 is lower than the set temperature, a positive temperature difference signal will be generated.
S' is output from the first and second temperature detectors 34,
35, so even if both output signals match, the temperature difference signal S' becomes the lubricating oil temperature control signal SS and is applied to the first and second flow rate regulating valves 30, 35.
32, high-temperature lubricating oil is supplied into the choke inner bearing 3 from the vicinity of the choke inner bearing 3, and the temperature of this vicinity is raised to a set temperature.
In this case, the temperature of the lubricating oil is determined by setting an upper limit on the temperature difference signal S' or setting the maximum heating temperature by the heater 31 so that the lubricating oil temperature has the set temperature as the upper limit or is higher than the set temperature by a predetermined value. It is preferable to keep the lubricating oil temperature as high as possible.By doing this, even if the temperature near the chock inner bearing 3 and the set temperature are significantly different, the lubricating oil temperature can be controlled more accurately, and the lubricating oil temperature can be controlled as described above. By making the temperature higher than the set temperature by a predetermined value and changing the temperature in accordance with the temperature signal S', the temperature near the chock inner bearing 3 can be raised to the set temperature more quickly. .

In this way, the temperature near the choke inner bearing 3 reached the set temperature, the temperature difference signal S' became zero, and the temperature of the lubricating oil supplied from the supply pipe 18 was maintained at the temperature near the choke inner bearing 3. In this state, the opening degrees of the first and second flow rate regulating valves 30 and 32 are stabilized.

The lubricating oil whose temperature has been controlled as described above flows from the supply pipe 18 through the flow path 20 and the hole 21 into the chock inner bearing 3, and flows into the chock inner bearing 3 and the chock 2 and roll 1 that fit the bearing 3. The journal part 1a is heated. Furthermore, the bearing 3
The lubricating oil that has flowed into the bearing 3 flows into the annular chamber 27 formed between the bearings 3 and directly heats the journal portion 1a. In this way, the inner chock bearing 3 and the journal portion 1a of the roll 1 are heated by the lubricating oil and maintained at the set temperature, causing thermal expansion by a predetermined amount. On the other hand, the chock 2 is also heated by the lubricating oil, but the overall heat capacity of the chock 2 is considerably larger than that of the bearing 3 and the journal portion 1a, and its outer surface side is naturally cooled. The diameter of the hole into which the bearing 3 is inserted does not increase that much. Therefore, by determining the set temperature appropriately, the clearance of the chock inner bearing 3 is
Reduced to appropriate value. From this point of view, the chock 2 may be actively cooled.

If we ignore the increase in the hole diameter on the chock 2 side, the coefficient of thermal expansion of steel is approximately 10×10 ^-6 /℃.
Therefore, when the diameter of the journal portion 1a is 350 mm, the heating temperature required to remove a clearance of 0.3 mm is approximately 86°C.

In this way, the clearance of the bearing 3 in the chock is kept small, so the roll 1 is accurately held by the bearing 3, and sufficient machining accuracy and finished surface roughness can be obtained without the need for a special steadying device. Therefore, the rotational speed of the roll 1 can be increased to the rotational speed during rolling, if necessary.

In the embodiment described above, the inner chock bearing 3
An example was described in which heated lubricating oil was supplied to the inside and the outer periphery of the journal portion 1a of the roll 1.
In order to heat the journal part 1a more effectively, a channel for circulating the lubricating oil may be provided in the journal part 1a, or fins may be provided, and various known methods may be employed as means for controlling the lubricating oil temperature. It goes without saying that it can be done.

As described above, according to the present invention, it is possible to precisely grind a roll with a chock without providing a special steady stop, and it is possible to prevent local changes in surface roughness due to the steady stop, and to prevent roll mounting. , measurement, and other operational inconveniences are solved, and the number of rotations of the rolls can be set appropriately high, so that effects such as more efficient grinding processing can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an embodiment of a chock-equipped roll grinding device according to the present invention, and FIG. 2 is an enlarged sectional view taken along the line ``--'' in FIG. 1...Roll, 2...Chock, 3...Bearing in choke, 4a, 4b...Bed, 5...Saddle, 6
...Chock cradle, 7... Support piece, 8... Receiver, 9... Clamp piece, 10... Headstock, 11... Carriage, 12...
Grinding wheel head, 13... Grinding wheel, 14... Lubricating oil tank, 15
...pump, 16...discharge pipe, 17a...first pipe, 17b...second pipe, 18...supply pipe, 1
9, 25...Joint, 20, 24...Flow path, 21, 23
... hole, 22 ... spacer, 27 ... annular chamber, 28 ... seal, 30 ... first flow rate adjustment valve, 31 ... heater, 32 ... second flow rate adjustment valve, 33 ... temperature setter, 34 ... first temperature detector , 35... second temperature detector, 36... first adder, 37... second adder, 38
…Amplifier.

Claims (1)

[Claims] 1 In equipment that grinds rolls with chock attached, there is a lubricating oil supply device that forcibly circulates lubricating oil to the chock inner bearing of the chocked roll, a temperature setting device, and detecting the temperature near the chock bearing. a first temperature detector for detecting the temperature of the lubricating oil supplied to the chock inner bearing section by the lubricating oil supply device; The lubricating oil temperature control device is equipped with a heater to heat the lubricating oil and controls the temperature of the lubricating oil supplied to the chock inner bearing part in order to maintain the temperature near the bearing at the temperature set in the temperature setting device. A roll grinding device with a chock, in which the clearance of the chock inner bearing portion can be kept small by setting a required value in the temperature setting portion.