JPH0464828B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a grinding device for grinding the outer peripheral roll surface of a roll outer ring of a rolling bearing type roll used, for example, as a roll for a leveler.

Prior Art When a rolling bearing type roll is used as a roll for a leveler, the outer peripheral roll surface of the roll outer ring is roughened by adhesion of scale, rolling oil, etc., wear, etc., which leads to a reduction in rolling accuracy. Therefore, it is necessary to frequently repeat correction grinding of the outer peripheral roll surface. However, since rotational force cannot be transmitted to the roll outer ring from the shaft side on which the bearing type roll is fitted, when using a commercially available grinder, the roll outer ring may rotate from the outside of the rolling bearing type roll due to chipping, etc. Unless force is applied, it is not possible to grind the outer roll surface of the roll outer ring in the assembled state. Even if this chipping causes rotational force to be applied to the roll outer ring from the side surface of the roll to grind the outer roll surface, the moment force will cause the roll outer ring to swing around, making the grinding accuracy unstable. Therefore, originally, this rolling bearing type roll was disassembled into pieces, only the roll outer ring was taken out, and the outer ring was ground as a single unit, thereby ensuring the accuracy of the roll outer ring itself.

In order to remove and grind the outer ring of the roll, the bearing type roll must be disassembled one by one, which is very time consuming, increases the number of processing steps, and makes disassembly and reassembly troublesome.

Furthermore, during disassembly and reassembly, the raceway surface of the shaft and outer ring may be damaged, leading to a decline in quality.

Therefore, a special machine for grinding the outer surface of the outer ring of a bearing-type roll, as seen in Japanese Patent Application Laid-Open No. 52-43195, was originally provided as a bucking bearing (back-up roll) grinding device for Sendzimir rolling mills. has been done. This is done by placing a bucking bearing on two drive rolls arranged in parallel, and using a brake shoe to stop the rotation of the saddle leg positioned between both drive rolls. Grinding is performed by pressing a grindstone onto the outer peripheral surface of the roll from diagonally above while rotating the outer ring of the roll.

Problems to be Solved by the Invention In this conventional machine, the height from the bottom surface of the saddle leg to the center of the back roll is used as the standard for setting the wall thickness of the roll outer ring. Due to wear and deformation inside the rolls, variations in the wall thickness of the outer ring of the rolls occur between all the back-up rolls.
It cannot be used for rolling bearing type rolls as single assembly parts with shafts without saddles.

In addition, since the back-up roll is supported from below by two parallel drive rolls and driven to rotate, and the grinding wheel is simply pressed diagonally from above for grinding, this pressing force alone cannot produce enough force at the position where the grinding wheel is pressed. The internal clearance (radial clearance) of a bearing type roll cannot be completely reduced to zero. For this reason, (a) If the center-to-center distance from the center of the back-up roll shaft, which is a long object, to each drive roll that supports it changes due to moment force or deflection due to the weight of each drive roll, etc. , the roll is not cylindrical.

(b) Since it is difficult to manage the pressing force between the two drive rolls that support the back-up roll so that it is uniform, it is difficult to achieve machining accuracy due to changes in the pressing force.

There are drawbacks such as.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention includes a support means for supporting a rolling bearing type roll via a shaft into which it is fitted, and a support means for rotatably supporting the roll outer ring of the rolling bearing type roll. and a grinding wheel for grinding the roll surface on the outer periphery of the roll outer ring, and the transmission wheel and the pusher roll are pressed against two points on the half circumference of the roll surface on the outer periphery of the roll outer ring to grind the roll outer ring. In addition to being biased toward the shaft, the grinding wheel is brought into contact between the two points on the half circumference of the roll surface to grind the roll surface, and the pressure contact force between the transmission wheel and the pusher roll can be adjusted. The line of action of the total resultant force of both pressure contact forces, the pressure contact force of the grinding wheel, and the rotational force of the transmission wheel and the grinding wheel is between the point of contact of the grinding wheel with the roll surface and the contact point of the roll outer ring. It is characterized by being set to coincide with a straight line passing through the radial center of the inner circumferential surface.

As a grinding device, a rolling bearing type roll is usually supported so that its axis is oriented horizontally, but a rolling bearing type roll is also supported vertically and connected to a transmission wheel and a pusher roll that are pressed from around the outer ring of the roll. It is possible to freely set the support direction and make it variable so that the weight of the support does not affect the support direction.

The shaft used to support the rolling bearing type roll may be the roll shaft itself that is used integrally as a part of the bearing type roll, or it may be an arbor or the like as an auxiliary member installed or prepared on the grinding machine side. It's okay to be hot. In the case of such an arbor, the radial clearance between the rolling element and the roll outer ring, that is, the so-called bearing clearance, can be maintained to the desired degree, compared to a rolling bearing type roll without an inner ring that receives the rolling elements from the inside. Those with decreasing outer diameters may be selected.

In addition, the rolling bearing type rolls to be ground are those whose outer ring surface is formed by the roll outer ring itself, or whose outer ring surface is formed by a metal ring tightly fitted to the outer ring of the roll. Furthermore, there are various types such as those formed by building up the outer circumference of the roll outer ring.

Operation With the above structure, the support means can fit the rolling bearing type roll through the roll shaft if it has a roll shaft, or to the arbor on the grinding device side even if there is no integrally used roll shaft. Through it,
Support without disassembly. The transmission wheel and the pusher roll are pressed against the roll outer ring of the supported rolling bearing type roll at two points on the half circumference from the outer periphery thereof, biased in the axial direction, and rotated between the roll outer ring and the shaft. This rotational drive is achieved regardless of whether the rolling bearing roll is supported horizontally, vertically, or in any other orientation. The grinding wheel contacts between the two points on the half circumference of the roll surface to grind the outer roll surface of the rotatably driven roll outer ring, but this contact also has the effect of urging the roll outer ring toward the shaft side. will be done. The urging side portion of the rolling bearing type roll on the urging direction line passing through the radial center of the inner peripheral surface of the roll outer ring toward the roll outer ring due to the total combined force of the pressure contact of the transmission wheel and pusher roll and the contact of the grinding wheel is radial The gap is set to zero, and grinding by the grinding wheel is performed on the biasing direction line where the radial gap is zero, with the inner peripheral surface of the roll outer ring, in other words, the radial center of the inner peripheral surface of the roll outer ring as a reference.

Example A first example shown in FIGS. 1 to 3 will be described. FIG. 1 is a front view, FIG. 2 is a side view, and FIG. 3 is an enlarged side view of main parts showing the grinding state. It is supported on the main body 11 and ground. In the rolling bearing type roll 10, for example, as shown in the figure, the roll inner ring 2 is fixed to the roll shaft 1, or the shaft and the inner ring are integrated, and the inner ring raceway surface 2a and the roll outer ring 3 orbit. A large number of rolling elements 4 such as rollers are incorporated in a state in which a radial clearance necessary for rotation of the bearing is provided between the bearing and the surface 3a.

A center headstock 13 and a tailstock 14 are provided on both ends of the grinding machine body 11, and a slide bed 12 is provided on the body 1 between the center headstock 13 and the tailstock 14, respectively. The center headstock 13 and the slide bed 12 are slidably mounted on the main body 1, and the tailstock 14 is fixedly mounted on the main body 11. The centers 15 and 16 of the center headstock 13 and tailstock 14 are clamped and engaged from both sides with center holes (not shown) provided on both end surfaces of the roll shaft 1 of the rolling bearing type roll 10,
The roll shaft 1 is supported and fixed horizontally. As a result, the rolling bearing type roll 10 is supported horizontally on the grinding machine main body 11 without being disassembled.

A rolling wheel 17, a pusher roll 18, and a grinding wheel 19 are arranged around the outer periphery of the supported rolling bearing type roll 10 and are mounted on the main body 11.

The rolling wheel 17 includes a V pulley 20 and a V belt 11.
It is rotatably driven by a continuously variable speed electric motor 22 via a fulcrum shaft 23, and is supported by a bearing 25 on a transmission wheel bracket 24 rotatably attached to a fulcrum shaft 23.
An elastic member such as rubber covering the outer periphery is pressed from above against the top U of the roll surface 3b on the outer periphery of the roll outer ring 3, thereby driving the outer ring 3 to rotate. The fulcrum shaft 23 of the bracket 24 is pivoted on a bearing portion 27 of a transmission vehicle base 26 on which the continuously variable speed electric motor 22 is disposed, and the base 26 is mounted on the slide base 12 via a height adjustment spacer 28. It is fixed on a transmission wheel frame 29 fixedly mounted on the transmission wheel frame 29. A push bolt 30 is screwed into the upper end of the transmission wheel base 26, the tip of which touches the driven surface of the transmission wheel bracket 24, and the bolt 30 is used to adjust the position of the transmission wheel 17 and to control the pressure contact force. Adjustments are made.

The pusher roll 18 has its shaft portion 31 engaged in a notch 33 of a pusher roll bracket 32 provided on the slide base 12, and is rotatably supported by a bearing 34 attached to the bracket 32. An elastic member made of rubber or the like that covers the roll outer ring 3 is pressed against the outer peripheral roll surface 3b from diagonally below the front surface (grindstone side) of the roll outer ring 3 to support the rotationally driven roll outer ring 3. There is a bracket 3 between the bracket 32 and the bearing 34.
A push bolt 35 is provided which is screwed into the outer ring 2, and the bolt 35 adjusts the pressing force of the pusher roll 18 against the outer circumferential surface 3b of the outer ring and adjusts the position of the roll 18.

The grinding wheel 19 is supported by the grinding machine main body 11 by a mechanism not shown, is rotated by a drive mechanism within the main body 11, and is moved forward and backward toward the workpiece by an operating mechanism (not shown) of the main body 11. .

Here, the transmission wheel 17, the pusher roll 1
8 and the grinding wheel 19, the positional relationship of the outer periphery of the roll outer ring 3 with respect to the roll surface 3b, and the directional relationship of the force acting on the roll surface 3b are set so that the radial clearance of the rolling bearing type roll 10 becomes zero. ing.

That is, as shown in FIG.
7 and the pusher roll 18 are pressed against two points within the front half circumference of the roll surface 3b, that is, within the half circumference on the side facing the grinding wheel 19, and the contact point of the grinding wheel 19 is between these two points. It is made to exist. Further, the contact point of the grinding wheel 19 with the roll surface 3b is the transmission wheel 17,
The line of action of the total resultant force D due to the pressure contact force of the pusher roll 18 and the grinding wheel 19 and the rotational force of the transmission wheel and the grinding wheel, that is, the line of action of the total resultant force D, which is directed toward the roll outer ring 3 and passes through the radial center of the inner circumferential surface 3a of the roll outer ring 3 It is set to be located on the biasing direction line x.
In other words, the line of action (biasing direction line) x of the total resultant force D passes through the contact point of the grinding wheel 19 with the roll surface 3b and the radial center of the inner peripheral surface 3a of the roll outer ring 3. It is set to match a straight line.

Regarding this point, a specific example will be shown.

In this example, grinding wheel dimensions, rotation speed, motor output, depth of cut, rotation speed of rolling bearing type roll, outer diameter of rolling bearing type roll, angle and load of pressure wheel, angle of pusher roll, φ600 x 80 width, 500R.PM, AC220V, 22KW, current value during grinding, 15A 20μm 28R.PM φ165 θ ₁ orδ=7° P ₁ = 886Kg θ ₂ = 16°, and the vertical component force F ₂ of the load by the pressure welding wheel is F ₂ = P ₁ cos θ ₁ = 886×cos7゜ = 879Kg. be. The pressing force P ₂ of the pusher roll to make the sum F ₂ +F ₄ = “0” of this vertical component F ₂ and the vertical component F ₄ of the load by the pusher roll is:
P ₂ = F ₂ /cos θ ₂ = 879/cos16° = 914Kg.

At this time, the horizontal component force F ₁ of the pressure welding wheel and the horizontal component force F ₃ of the load due to the pusher roll are as follows: F ₁ = P ₁ sin θ ₁ = 886×sin7゜ = 108 Kg F ₃ = P ₂ sin θ ₂ = 914 ×sin16゜ = 252Kg, and the rotational force A ₁ is the rolling friction coefficient μ = 0.1
Then, A ₁ = P ₁ × μ = 886 × 0.1 = 88.6 Kg, and the resultant force D ₁ is D ₁ = F ₁ + F ₃ = 108 + 252 = 360 Kg. From the general formula for grinding, the tangent of the grinding wheel is Force F _Gt
is, F _Gt = 48Kg Also, the pressing force F _Ct of the grinding wheel is, assuming that the ratio K _G of normal grinding force and tangential grinding force is 1.2, F _Ct = F _Gt・K _G = 48 × 1.2 = 57.6 Kg, The tangential force of the grinding wheel F _GT is the rotational force of the pressure welding wheel
D which is canceled by A ₁ and acts on the biasing direction line x is D=D ₁ +F _Ct =360+57.6 =417.6Kg.

Therefore, in the grinding apparatus configured as described above, the roll shaft 1 of the rolling bearing type roll 10 is
is supported between the center headstock 13 and the tailstock 14, and its roll outer ring 3 is supported by the transmission wheel 17.
and is supported and rotated by the pusher roll 18, and in this state, the roll surface 3 on the outer periphery of the roll outer ring 3
B is ground by the grinding wheel 19.

In this case, the roll outer ring 3 is pressed against the roll inner ring 2 and the roll shaft 1, which are equivalent to the same body, while pushing the rolling elements 4 on the side on which the total resultant force D acts, and the roll outer ring 3 is pressed against the roll inner ring 2 and the roll shaft 1, which are the same body, and the roll inner and outer ring raceway surfaces 2a, 3a and the rolling elements 4 are pressed against each other (there is no movable gap between the roll inner ring 2 and the roll shaft 1, and even if there is, the roll inner ring 2 is simply pressed against the roll shaft 1 in the same way, and the operational There is no effect.)

As a result, when the 4 groups of rolling elements are regarded as one ring (4 groups of rolling elements pseudo ring), the inner and outer peripheries of this 4 groups of rolling elements pseudo ring and the raceway surfaces of the inner and outer rings of the roll 2
a and 3a are brought into pressure contact with each other on the line of action x of the total resultant force D, and as a result, the radial clearance between the roll inner and outer rings 2 and 3, that is, the radial clearance of the rolling bearing type roll 10, becomes zero. In addition, in this press-contact state, the roll inner and outer rings 2 and 3
The respective radial center points of the raceway surfaces 2a, 3a and the inner and outer peripheries of the four-group pseudo ring of rolling elements are aligned on the line of action x with precision according to their respective roundnesses.

Therefore, the grinding wheel 19 is capable of grinding the roll outer ring 3 in a portion where the radial clearance is zero, that is, in a portion on the line of action x of the total resultant force.
The roll surface 3b on the outer periphery is to be ground, and the roll outer ring 3 is centered on the radial center point of the raceway surface 3a on the line of action x, and the roll shaft 1, transmission wheel 17, pusher roll 18, and grindstone Since the wheel 19 is supported at four points and rotated without wobbling, the grinding wheel 19 performs grinding based on the raceway surface 3a of the roll outer ring 3, in other words, its radial center point. . For this reason, the roll surface 3b on the outer periphery of the roll outer ring 3
The raceway surface 3a is ground with high precision to have a uniform wall thickness and roundness without being affected by surface conditions such as roughness, damage, uneven wear, etc.

As described above, the line of action of the combined force of the combined force A and the pressing force B passes through the contact point of the grinding wheel 19, and the line of action x of the total combined force D and the line of action of the combined force of the grinding wheel 19 are Since the method of aligning the straight line passing through the contact point with the straight line passing through the contact point is adopted, the contact line of the grinding wheel 19 with the roll outer ring 3 may be located near the line of action x, as long as the effects of the present invention are not impaired. , should be understood to be included in this invention.

The slide bed 12 is mounted on the grinding machine body 11 so as to be slidable in the axial direction of both centers 15 and 16 by a guide part 36, and a pinion 37 provided inside the slide bed 12 is mounted on the grinding machine body 11 so as to be slidable in the axial direction of both centers 15 and 16. Rack 38
It's meshing with each other. The pinion 37 is fixed on an operating shaft 39 rotatably attached to the slide bed 12, and a handle 40 is attached to the end of the operating shaft 39 exposed outside the slide bed to slide the slide bed 12. let Although not shown, the center headstock 13 slidably mounted on the grinding machine main body 11 is attached to the slide bed 1, for example.
It is slid by the same drive mechanism as 2.

FIG. 4 shows another embodiment, in which the resultant force A explained in the embodiment of FIG.
The transmission wheel 17 is shifted toward the front side of the outer ring 3 by δ, and the contact position with the outer circumferential surface 3b of the outer ring 3 is moved closer to the front side of the outer ring 3 than the top U of the outer ring outer circumferential surface 3b. be.

The locations of the transmission wheel 17, pusher roll 18, and grinding wheel 19 are not necessarily limited to those in the embodiments described above.
7 and the grinding wheel pusher roll 18 may be pressed against two points within the half circumference of the roll surface 3b on the outer periphery of the roll outer ring 3 to urge the roll outer ring 3 toward the roll shaft 1 side. However, due to the bias, there must be enough space between them to allow the grinding wheel 19 to come into contact with the roll surface 3b at the portion where the radial gap becomes zero.

The roll surface 3b of the rolling bearing type roll 10 is
A metal ring 41 is attached to the roll outer ring 3 as shown in FIG.
Although there are cases in which the outer ring 3 is made of a material different from that of the outer ring 3 by applying a build-up 42 as shown in FIG. be able to.

Further, in each of the above embodiments, the rolling bearing type roll 10 that is the object to be ground has the roll shaft 1, but even if the roll shaft does not have a roll shaft, the grinding machine is provided as an auxiliary instead of the roll shaft. A rolling bearing type roll can be fitted to an arbor or the like, and the grinding can be carried out by supporting the material through the arbor in the same manner as in the above embodiment. Furthermore, even if it is a rolling bearing type roll without a roll inner ring, it is of course possible to support it via the roll shaft 1 or arbor and perform grinding as described above, but as shown in FIG. Especially when grinding is carried out by fitting and supporting a rolling bearing type roll 52 without a roll inner ring.
Depending on how the outer diameter of the arbor 51 is selected, the rolling elements 4
The radial gap between the roller and the outer ring 3 can be suppressed as much as possible, and the grinding accuracy can be further improved.

In the embodiment, the shaft of the rolling bearing type roll is supported at both end faces by the center main shaft and the center of the tailstock, but the invention is not limited to this. For example, it may be fixed with a steady rest, etc. Just support it.

Further, if a spacer 28 is provided between the slide bed 12 and the transmission wheel base 26 as in the embodiment, it is easy to adapt to changes in the size of the workpiece. of,
Of course, if the device is replaced with a device such as a hydraulic cylinder, remote control, automatic control, etc. are possible.

Effects As detailed above, according to the present invention, various excellent effects as listed below can be obtained.

(1) A support means for supporting a rolling bearing type roll via a shaft into which it is fitted, a transmission wheel for rotationally driving the roll outer ring of the rolling bearing type roll together with a support scoop, and a pusher roll for rotatably supporting the roll outer ring. and a grinding wheel for grinding the roll surface on the outer periphery of the roll outer ring, regardless of whether there is a roll shaft or not.
While supporting the rolling bearing type roll as it is, the roll outer ring is driven to rotate between the shaft and the roll outer ring by pressure contact of a transmission wheel and a pusher roll from the outer periphery, and correction grinding of the roll surface on the outer periphery of the roll outer ring is performed. be able to.

Therefore, it is possible to grind the roll surface without disassembling the rolling bearing type roll, and the man-hours such as disassembling and reassembling the rolling bearing type roll can be completely omitted, thereby reducing the grinding setup. Economical efficiency can be improved by significantly reducing processing man-hours as well as man-hours and cleaning man-hours.

Moreover, since there are no dents or damage caused during disassembly and assembly, it is possible to simultaneously maintain bearing performance before re-grinding and improve the quality of rolled products.

(2) The transmission wheel and the pusher roll are pressed against two points on the roll surface half circumference of the outer circumference of the roll to urge the roll outer ring toward the shaft, and the grinding wheel is pressed against the two points on the roll surface half circumference of the roll outer ring. Since the roll surface is ground by contact between the points, the roll surface can be ground regardless of the supporting posture of the rolling bearing type roll.

Therefore, during grinding, it is possible to perform grinding in a posture that is not affected by the rolling elements of the rolling bearing type roll or the weight of the roll outer ring, for example, in a vertical posture, which greatly improves the accuracy of the grinding process. I can do it.

(3) The pressing forces of the transmission wheel and the pusher roll are adjustable, and the line of action of the total resultant force of the pressing forces of the two, the pressing force of the grinding wheel, and the rotational force of the transmission wheel and the grinding wheel is The grinding wheel is set to match the straight line passing through the contact point with the roll surface and the radial center of the inner circumferential surface of the roll outer ring, so the grinding wheel comes into contact with the roll surface, and the roll surface on the outer periphery of the roll outer ring is ground while being supported at four points by the shaft, transmission wheel, pusher roll, and grinding wheel.

Therefore, the roll outer ring does not run out, and moreover, grinding is performed based on the inner circumference or center of the roll outer ring, and improvements in wall thickness uniformity, cylindricity, and roundness are achieved. be done.

[Brief explanation of drawings]

Fig. 1 is a front view of the embodiment, Fig. 2 is a side view, Fig. 3 is an enlarged view of main parts for explaining the operation, Fig. 4 is a view equivalent to Fig. 3 of another embodiment, Fig. 5 , Fig. 6 is a partial sectional view showing another example of a rolling bearing type roll as an object to be ground, and Fig. 7 is a rolling bearing type roll without a shaft or inner ring using an arbor as an auxiliary member on the grinding machine side. FIG. 8 is a partial cross-sectional view showing a case in which the support is supported, and FIG. 8 is a schematic diagram showing a state in which a resultant force is applied. {1... Roll shaft, 2... Roll inner ring, 3... Roll outer ring, 4... Rolling element} 10... Rolling bearing type roll, {3... Roll outer ring, 4... Rolling element} 52... Rolling bearing type roll, {15, 16 ...Center, 51
... Arbor} (supporting means), 17... Transmission wheel, 18...
Pusher roll, 19... Grinding wheel, 41... Metal ring, 42... Overlay, D... Total resultant force, x... Force direction line.

Claims (1)

[Scope of Claims] 1. Supporting means for supporting a rolling bearing type roll via a shaft into which it is fitted, a transmission wheel that supports and rotationally drives the roll outer ring of the rolling bearing type roll, and a transmission wheel capable of rotating the roll outer ring. and a grinding wheel for grinding the roll surface on the outer periphery of the roll outer ring, the transmission wheel and the pusher roll are pressed against two points on the half circumference of the roll surface on the outer periphery of the roll outer ring,
The roll outer ring is urged toward the shaft, and the grinding wheel is brought into contact between the two points on the half circumference of the roll surface to grind the roll surface, and the transmission wheel and pusher roll are pressed together. The force is adjustable, and the line of action of the total resultant force of both the pressing forces, the pressing force of the grinding wheel, and the rotational force of the transmission wheel and the grinding wheel is the contact point of the grinding wheel with the roll surface. A roll outer ring surface grinding device for a rolling bearing type roll, characterized in that the roll surface is set to match a straight line passing through the radial center of the inner peripheral surface of the roll outer ring. 2. The device for grinding the surface of a roll outer circumferential surface of a rolling bearing type roll according to claim 1, wherein the shaft fitted into the rolling bearing type roll is the roll axis of the rolling bearing type roll itself. 3. An apparatus for grinding an outer circumferential roll surface of a roll outer ring of a rolling bearing type roll according to claim 1, wherein the shaft fitted into the rolling bearing type roll is an auxiliary member on the grinding apparatus side. 4. The shaft fitted into the rolling bearing type roll is fitted into the inner side of the rolling element group inside the roll outer ring of the rolling bearing type roll. Device. 5. The roll surface grinding device for the outer circumference of a roll outer ring of a rolling bearing type roll according to claim 1, wherein the roll surface of the outer circumference of the roll outer ring is formed by the roll outer ring itself. 6. The roll surface grinding device for the outer periphery of a rolling bearing type roll according to claim 1, wherein the roll surface of the outer periphery of the roll is formed by a metal ring tightly fitted to the outer periphery of the roll. 7. The roll surface grinding device for the outer periphery of a rolling bearing type roll according to claim 1, wherein the roll surface of the outer periphery of the roll is formed by building up on the outer periphery of the roll outer ring.