JP3046519U - Belt type roll polishing machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] A belt meanders in the direction of a wheel axis during belt conveyance, causing a positional shift. This causes a reduction in grinding ability or a grinding called a feed mark generated on a ground or polished surface. The occurrence of streak areas in different situations,
Further, it is an object of the present invention to provide a device capable of preventing a decrease in ground surface quality such as smoothness or shape accuracy such as cylindricity. A touch wheel provided with at least one centering alignment wheel for preventing a grinding belt from being displaced in a roll axis direction, and a touch wheel disposed in parallel with a roll to be polished, and the touch wheel A belt-type polishing apparatus disposed on a belt transfer path between a driving wheel disposed in parallel with and separated from the belt.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 This invention relates to a belt-type roll polishing machine, and particularly to a device for grinding and polishing the surface of a metal roll and a thermal spray coating coated on the surface. In particular, the present invention provides various roll surfaces such as a Yankee dryer used in the papermaking process, such as grinding and polishing while being installed on site or mounted on a machine tool such as a lathe. It is used for performing mechanical processing.

[0002]

[Prior art]

 Generally, in order to adjust the size, shape or roughness of the surface of various mounting rolls, for example, by grinding or polishing, it is common to remove the roll from the machine and machine it using a machine tool such as a grinder. is there.

[0003] Recently, machine tools have been developed for machining the surface of such rolls without removing them from the apparatus, without removing them. A typical example is that an endless grinding belt is applied between two wheels having driving and driven functions by applying a predetermined tension, and the grinding surface of the grinding belt is touch wheel ( There is a method of grinding and polishing by pressing the surface of the roll to be ground through a contact wheel). A typical example of such a machine tool is disclosed in Japanese Utility Model Laid-Open No. 2-74155.

The above-described conventional apparatus is a machine tool having a relatively simple configuration, but has the following problems. This polishing apparatus applies a required amount of tension to the endless grinding belt in order to prevent the endless grinding belt from being displaced due to a shear force on the surface of the roll to be polished. . However, during actual work, the belt may be broken due to excessive tension.

In the above apparatus, a wheel such as a touch wheel has a function of pressing the belt itself against the surface of the roll to be polished at the same time as transporting the grinding belt, so that the contact surface with the belt is necessarily flat. It is formed in. For this reason, the belt may be displaced in the axial direction of the wheel (that is, in the roll axis direction) from the initial mounting position due to a shearing force (roll crown) generated between the roll to be polished and the belt. In order to reduce this, the contact surface with the belt is generally lined with an elastic material such as hard rubber, and iris-shaped grooves are formed on the roll surface. It wasn't good. If displacement occurs during the grinding operation, the grinding contact area with the roll to be polished changes, which leads to a decrease in grinding efficiency. In addition, it was necessary to stop the roll polishing device after a suitable time had elapsed and to adjust the state of attachment of the grinding belt.

[0006] Furthermore, in the conventional apparatus, a streak-like area having a different grinding condition called a feed mark often occurs on the roll surface to be polished, and the quality of the ground surface such as smoothness or the shape accuracy such as cylindricality is poor. There was also the problem of being bad. If such a phenomenon occurs, the surface shape of another roll in contact with the roll to be polished may be deteriorated. In addition, there has been a problem that the occurrence of a streak-like region and a decrease in surface shape such as smoothness often adversely affect surface quality such as formation of a paper product which is in direct contact with the roll surface.

[0007]

[Problems to be solved by the invention]

 The problem to be solved in the present invention is a disadvantage of the conventional belt-type roll polishing apparatus described above, that is, the belt is meandering in the axial direction of the wheel during belt conveyance, resulting in displacement. Deterioration of the grinding ability resulting from this, or the occurrence of streak-like areas with different grinding conditions called feed marks on the polished surface due to grinding, as well as grinding surface quality such as smoothness or shape such as cylindricity It is an object of the present invention to provide a device capable of preventing a decrease in accuracy.

[0008]

[Means for Solving the Problems]

 The above-mentioned problem can be solved by configuring the belt polishing machine as follows. That is, the present invention provides a touch wheel disposed parallel to the roll to be polished and a drive wheel for driving a belt disposed parallel to and separated from the touch wheel. An endless roll grinding belt is stretched between the belts, and the grinding surface of the belt is pressed against the peripheral surface of the roll to be polished. A belt-type polishing apparatus characterized in that one or more centering alignment wheels for preventing displacement are arranged on a belt transfer path between the touch wheel and the drive wheel. In the apparatus of the present invention, it is preferable to use a tapered roll of a truncated cone as the alignment wheel. In the apparatus of the present invention, it is preferable that the alignment wheels are disposed so as to be tapered in reverse when two of the alignment wheels are used as a pair.

[0009]

[Embodiment of the invention]

 The belt-type roll polishing apparatus according to the present invention is used to polish the surface of a roll to be polished by arranging it facing the roll 1 to be polished, and mainly includes a touch wheel 2 (also referred to as a contact wheel), a drive wheel 5 and One or more preferably two alignment wheels 3 and 4 are provided, and an endless grinding belt 6 is stretched between them.

FIG. 1 shows an example of the present invention in which only one alignment wheel is provided. The alignment wheel 3 is used to prevent the grinding belt 6 from meandering while being shifted in the roll axis direction (belt width direction) due to the influence of the roll crown during running, and to perform centering. As shown in FIG. 2, in the method of arranging two alignment wheels, these wheels 3 and 4 are arranged so as to have a taper opposite to each other and the roll shaft of the roll 1 to be polished. Since the belts can be shifted in opposite directions along the direction, the centering of the belt can be controlled with high precision. In other words, the grinding belt 6 is always held at the correct wrapping movement position by the action of the alignment wheels 3 and 4 peculiar to the present invention, so that the grinding belt 6 can be correctly brought into contact with the roll 1 to be polished. .

As the shape of the alignment wheels 3 and 4, it is preferable to use, for example, a truncated conical shape, that is, a tapered roll as shown in FIG. 3, and use one or two such tapered rolls as a belt. By arranging the belt in the winding route, the meandering of the belt can be effectively prevented.

With the configuration described above, in the device of the present invention, since the grinding belt 6 is subjected to the centering action by one or two alignment wheels 3 and 4, the grinding belt 6 extends in the generatrix direction of the touch wheel 2. It does not shift along. As a result, since the grinding is uniformly performed at a fixed position on the surface of the roll to be polished, improvement in grinding efficiency, grinding accuracy, and product yield can be expected.

[0013] Furthermore, the grinding capability, that is, the portion at the contact surface at both ends of the belt, has significantly reduced grinding ability, and the amount of grinding removal and the surface roughness are usually different from those of the clean contact surface closer to the center. These lead to the formation of streak-like areas with different grinding conditions called feed marks on the surface to be ground (polished). In this regard, according to the present invention, since the displacement of the grinding belt 6 can be prevented, the deterioration of the quality of the grinding surface such as these feed marks can be solved.

Further, according to the present invention, the tension to be applied to the grinding belt 6 is essentially large because it is not necessary to have a function of preventing the belt 6 from being displaced in the wheel generatrix direction. It is not necessary to carry out, and the danger of belt breakage can be eliminated.

[0015]

【Example】

 Example 1 In this example, a two-wheel type conventional apparatus (Japanese Utility Model Application Laid-Open No. 2-74155) and a four-wheel type (a roller polishing apparatus equipped with two alignment wheels) according to the present invention were prepared. Then, for a wet paper web dryer roll having a diameter of 1500 mm and a surface length of 2000 mm, grinding required for five man-hours was carried out, with one belt manipulating a belt-type polishing device running from one end to the other end of the roll. The usage times were compared. The shape of the touch wheel used for this device was 350 mm in diameter and 150 mm in width, the wheel drive motor was 15 kW, the grinding belt was 125 mm in width, and 3300 mm in length. Then, when the belt-type polishing apparatus ran by grinding the distance from one end to the other end of the roll, the amount of displacement of the belt along the touch wheel generatrix was examined.

As a result, the displacement amount of the conventional apparatus was an average value of about 30 mm in the direction opposite to the advance of the polishing apparatus with respect to the reference position. Therefore, in order to compensate for the decrease in the effective grinding length due to the shift of the mounting position of the endless belt with respect to the touch wheel 2, the tension of the endless belt is reduced every one to three man-hours. Then, it became necessary to correct the belt position. This required an average of 5 minutes each time, accounting for 20 to 30% of the total man-hours.

On the other hand, in the roll polishing apparatus according to the present invention, the amount of displacement is within a range of approximately ± 5 mm with respect to the reference position, and is considered to be within the error range. Did not need to be repositioned. Based on these results, the use of the device of the present invention has reduced the required man-hours by at least 20% compared to the conventional device.

Example 2 In this example, the surface of a 13Cr steel alloy spray-coated film coated on the surface of a Yankee dryer roll for producing thin tissue paper for home use having a diameter of 3000 mm and a surface length of 3200 mm was ground. The half-face length on the drive side of the Yankee dryer roll was carried out using the same conventional apparatus as in Example 1, and the half-face length on the dynamic operation side was carried out using the same belt-type roll polishing apparatus of the present invention as in Example 1. As a result, with the conventional device, a streak-like area with a different grinding condition called a feed mark with a period of about 60 mm occurred on the surface to be ground.

On the other hand, in the device of the present invention, almost no occurrence of a feed mark was recognized. In particular, when the section of the feed mark was measured with a palpable surface roughness meter to examine the uneven shape, a step of 2-3 μm was found. Therefore, a detailed comparison of the formation of the product without wet paper drying was carried out, and it was found that the dry processing on the half of the drive side using a conventional roll polishing device showed a slight unevenness in the formation. There has occurred. However, the operation was continued as it was not out of the standard. After 3 months, the formation quality of the product dried on the 1/2 of the drive side of the Yankee dryer roll was out of the standard.When the relevant portion of the roll was examined again, the roll surface was striped. A pattern in the shape of a letter was generated. Then, when the surface roughness of the portion was measured, the roughness was 5 to 10 μm Rmax, which was larger than immediately after grinding. When the pattern was examined in more detail, it was found to be spiral and coincide with the position of the feed mark generated during the grinding. In addition, when the concentration of the external additive residue on the surface of these parts was quantified, it was found to be about three times larger than that of the part without the feed mark, indicating that corrosion by the external additive was related to the increase in surface roughness. It was suggested. Based on the results of these investigations, it is possible that corrosion in the scratch-like areas, called feed marks, which occur during belt grinding and that have different grinding conditions, may induce corrosion, and become rougher with the lapse of operating time. It has been found that this has a negative effect on the formation quality.

On the other hand, in the roll grinding portion by the apparatus according to the present invention in which the feed mark area was not generated from the beginning, the surface quality was stable throughout the paper product without any change in surface roughness.

The belt grinding in this embodiment was carried out with a Yankee dryer roll infused at room temperature and steam and the dryer surface maintained at about 130 ° C., the same as during operation. As a result, no feed mark was generated by grinding under any temperature condition, and the produced paper product had stable formation quality from beginning to end.

Example 3 Using a belt polishing machine similar to that of Example 1, a Ni—Cr alloy sprayed coating in which a surface of a Yankee dryer roll for producing thin tissue paper for home use having a diameter of 3000 mm and a surface length of 3200 mm was plasma spray coated. Was ground. In this example, there was no consumption due to belt breakage.

[0023]

[Effect of the invention]

 As described above, according to the present invention, the grinding belt does not laterally shift (meander) in the axial direction of the roll (wheel) during the grinding operation. As a result, the deterioration of grinding performance is reduced, the surface to be ground, the formation of trace-like areas with different grinding conditions called feed marks on the polished surface, and the quality of the ground surface such as smoothness or the shape such as cylindricity are further reduced. Improved accuracy can be achieved.

[Submission date] October 24, 1997

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

[Means for Solving the Problems]

The above-mentioned problem can be solved by configuring the belt polishing machine as follows. That is, the present invention provides a touch wheel disposed parallel to the roll to be polished and a drive wheel for driving a belt disposed parallel to and separated from the touch wheel. it passes over the endless roll grinding belt during, the belt roll polishing apparatus that polishes by pressing a grinding surface of the belt on the peripheral surface of the polishing roll, the grinding belt in the roll axis direction A belt-type roll polishing apparatus characterized in that one or more alignment wheels for centering to prevent displacement are arranged on the belt transfer path between the touch wheel and the drive wheel. is there. In the apparatus of the present invention, it is preferable to use a tapered roll of a truncated cone as the alignment wheel. In the apparatus of the present invention, it is preferable that the alignment wheels are disposed so as to be tapered in reverse when two of the alignment wheels are used as a pair.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing another embodiment of the device of the present invention.

FIG. 3 is a schematic diagram illustrating a shape of an alignment wheel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roll to be ground 2 Touch roll 3 Alignment wheel 4 Alignment wheel 5 Drive wheel 6 Grinding belt

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[Procedure amendment]

[Submission date] October 24, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims for utility model registration

[Correction method] Change

[Correction contents]

[Utility model registration claims]

Claims (3)

[Utility model registration claims] A touch wheel is provided in parallel with a roll to be polished, and a drive wheel for driving a belt is provided in parallel with the touch wheel apart from the touch wheel. In a belt-type roll polishing machine in which an endless roll grinding belt is stretched and the grinding surface of the belt is pressed against the peripheral surface of the roll to be polished, the grinding belt is displaced in the roll axis direction. A belt-type polishing apparatus, wherein one or more alignment wheels for centering for preventing the occurrence of rubbing are disposed on a belt transfer path between the touch wheel and the drive wheel. 2. The roll polishing apparatus according to claim 1, wherein the alignment wheel uses a tapered roll having a truncated cone shape. 3. The alignment wheel according to claim 2,
The belt-type roll polishing apparatus according to claim 1 or 2, wherein the pair of tape-type roll polishing apparatuses is arranged so as to have a reverse taper when used in pairs.