JP6194874B2 - Maintenance wiper for steelmaking - Google Patents

Description

  The present invention relates to a steelmaking maintenance wiper, and more particularly to a steelmaking maintenance wiper having a polishing function for polishing a roll surface on a draining wiper that removes cooling water from a rolling mill roll for steelmaking.

  Usually, a steel rolling mill has a structure in which the upper and lower surfaces of a rolled steel sheet are sandwiched between a pair of work rolls and sandwiched between a pair of backup rolls from the outside, and a large number of these roll pairs are arranged in the feed direction of the rolled steel sheet. Is. Since the work roll is in contact with the hot rolled steel sheet, cooling water is showered from the nozzle to suppress the temperature rise, but a draining wiper is provided to prevent this cooling water from being applied to the rolled steel sheet. (See Patent Documents 1 and 2). Further, adhesion of metal deposits and generation of heat cracks cannot be avoided on the work roll surface during the rolling operation, and the quality deteriorates when these are transferred to the rolled steel sheet. In addition, metal scraps adhere to the surface of the backup roll, and minute cracks, rough skin, and uneven wear occur due to pressure contact with the work roll. For this reason, the work rolls are usually severely damaged, so they are exchanged in several hours, and the backup rolls are exchanged about once a month. In order to replace these rolling rolls, it is necessary to stop the rolling line, which is a major factor for reducing the production efficiency.

  An apparatus (ORG) that polishes the rolling roll online in order to improve the productivity by reducing the rolling frequency of the rolling roll and to suppress the progress of surface deterioration of the rolling roll in order to maintain the quality of the rolled steel sheet. Is often installed (see Patent Document 3). In other words, a roll polishing device is installed in the rolling mill, and the surface of the work roll is corrected and polished by bringing the abrasive material into contact with the outer peripheral surface of the work roll at a predetermined surface pressure during the rolling operation. To eliminate the obstacles caused by wear of the work roll, aiming to improve the quality of the rolled steel sheet and the productivity.

  On the other hand, draining wipers widely used in rolling mills have an effect of preventing rolling mill cooling water from being applied to the rolled steel sheet, but do not have a function of polishing the roll surface. The on-line wiper device for a rolling roll described in Patent Document 4 uses an elastic soft wiper having a draining function and a hard wiper with abrasive grains having a polishing function as a head of a common guide rod toward the upstream portion in the rotation direction of the work roll. It is a system in which the surface polishing effect and the draining effect can be selectively used by pressing a soft wiper and a hard wiper by means of an air cylinder that is sequentially arranged and has a compressed air path whose pressure can be set in two stages. Here, the surface pressure of the soft wiper is kept constant by the elastic force of the coil spring, and the surface pressure of the hard wiper can be adjusted to a range higher than the surface pressure of the soft wiper by the driving force of the guide rod by the air cylinder. Yes.

Since the devices described in Patent Documents 3 and 4 require a power space, it is difficult to incorporate them into existing facilities, and it is necessary to introduce them when renewing the facilities, which requires initial costs and maintenance costs (running costs) for operation. . Since any technique is a separate device from the draining wiper, the cost is high and the installation space is limited.
Combining conventional abrasive grains (resinoid grindstones, etc.) with a wiper cannot be integrated by pressure molding due to brittleness, and even when bonded, due to differences in thermal expansion and water absorption dimensional change It will peel off.

  By the way, conventionally, various types of resin abrasives in which abrasive grains are filled in a resin have been provided. As typical ones, there are the following methods for filling abrasive grains into a laminated molded product (fiber reinforced plastic). A prepreg as a material of the laminated molded product is produced by attaching a resin (varnish) in which a phenol resin, an epoxy resin, an unsaturated polyester resin, or the like is a solution to a base material such as a plain woven glass fiber cloth or a carbon fiber cloth. Here, when the abrasive grains are filled, they are mixed and dispersed in the resin solution in advance, and are attached to the substrate together with the resin. For example, Patent Document 5 discloses a nonwoven fabric constituted by impregnating a bulky nonwoven fabric base material mainly made of synthetic fibers with a thermosetting resin binder containing abrasive grains and fixing the abrasive grains to the base material. An abrasive is described. However, when this method fills a certain amount of abrasive grains, it becomes difficult to uniformly disperse and stabilize in the solution under the influence of the specific gravity difference with the abrasive grains, resulting in uneven adhesion. As a result, the distribution of the filling amount varies. This is particularly noticeable with abrasive grains having a high specific gravity. As a result, the quality of the laminated molded product is not stable, for example, the filler is overfilled and peels between layers.

  In addition, in Patent Document 6, an adhesive precursor made of a thermosetting resin is applied to a nonwoven fabric fiber coated with a heat-resistant resin, and abrasive particles are dispersed and adhered onto the adhesive precursor. And the point which manufactures a nonwoven fabric abrasive | polishing material by evaporating an organic solvent and water from an adhesive agent precursor and drying it is described. It also describes that a plurality of bulky non-woven abrasives to which abrasive grains are bonded are laminated and press-heated to produce a three-dimensional abrasive with high density. Here, the heat-resistant resin is a resin having a melting point or thermal decomposition temperature that is at least 20 ° C. higher than that of the nonwoven fabric fiber, and is at least one selected from the group consisting of melamine crosslinked acrylic resin, phenol resin, epoxy resin, and urethane resin. It is. However, since it is difficult for the thing of this patent document 6 to make an abrasive grain adhere uniformly until it reaches the fiber inside a nonwoven fabric, it is difficult to disperse | distribute an abrasive grain uniformly inside a three-dimensional molded product. .

JP-A-5-310 JP 2002-178011 A Japanese Utility Model Publication No. 7-33402 JP-A-5-154517 JP-A-6-155310 JP 2007-290061 A

  Therefore, in view of the above-mentioned situation, the present invention intends to solve the problem that the rolling mill wiper for removing the cooling water of the steelmaking mill roll is deteriorated on the surface of the rolling mill roll by rolling operation (for example, generation of heat cracks or metal The object is to provide a steelmaking maintenance wiper that has a roll surface polishing function to reduce the progress of adhesion of the welded material and can be easily attached to existing equipment.

  In order to solve the above-mentioned problems, the present invention provides a steelmaking maintenance wiper having a polishing function for polishing the roll surface to a draining wiper that removes cooling water from a rolling mill roll for steelmaking. A steelmaking maintenance wiper is characterized in that a water draining pad material made of a resin impregnated felt or a nonwoven fabric is laminated on the surface of a polishing resin laminate molded plate uniformly dispersed in the invention (claim 1).

The present invention also provides a steelmaking maintenance wiper having a polishing function for polishing a roll surface on a draining wiper for removing cooling water from a rolling mill roll for steelmaking, wherein the prepreg has a woven fabric impregnated with a thermosetting resin. Adhering a polishing resin laminate molding plate in which abrasive grains are uniformly dispersed in a nonwoven fabric to one side of a cloth-based thermosetting resin laminate laminated with a resin, impregnating the surface of the polishing resin laminate molding plate with resin A steelmaking maintenance wiper characterized in that a draining pad material made of felt or non-woven fabric was laminated (claim 2).

  Here, the polishing resin laminate molded plate is formed by impregnating a non-woven fabric with abrasive grains with an abrasive filler attached to the non-woven fabric, impregnating a thermosetting resin varnish into a prepreg, and laminating a plurality of the prepregs and heating with pressure. It is molded and the abrasive grains are uniformly dispersed (claim 3).

  More specifically, the polishing resin laminate molding plate is a thermosetting resin varnish formed on a nonwoven fabric with abrasive grains in which an abrasive filler made of at least one of silicon carbide abrasive grains and alumina abrasive grains is adhered to the nonwoven fabric. To form a prepreg, in which the non-woven fabric with abrasive grains is 60 to 90% by weight, the solid component of the thermosetting resin varnish is 10 to 40% by weight, and a plurality of the prepregs are laminated and pressed. Heat-molded (Claim 4).

  In the polishing resin laminate molded plate, the nonwoven fabric is made of a polyamide resin, and the thermosetting resin is made of at least one resin selected from epoxies and phenols, and the silicon carbide abrasive grains or More preferably, the average particle size of the alumina abrasive grains is 27 to 75 μm, and the nonwoven fabric is 36 to 54% by weight and the abrasive filler is 24 to 36% by weight based on the entire molded plate. (Claim 5).

  In addition, the draining pad material is made by impregnating a non-woven fabric made of felt made of wool or nylon fiber, polyester fiber, polypropylene fiber, or meta-aramid fiber with a phenol resin varnish, and laminating it to pressurize Heat-molded (Claim 6).

  The cloth-based thermosetting resin laminate is obtained by impregnating a woven cloth with a phenol resin varnish to produce a prepreg, and laminating the prepreg and pressurizing and heating-molding it (Claim 7).

  The maintenance wiper for steelmaking of the invention according to claim 1 or 2 as described above is a maintenance wiper for steelmaking provided with a draining wiper for removing cooling water of a rolling mill roll for steelmaking and a polishing function for polishing the roll surface. In addition, a water drain pad material made of resin-impregnated felt or nonwoven fabric is laminated on the surface of a polishing resin laminate molded plate in which abrasive grains are uniformly dispersed in the nonwoven fabric. Along with the water draining function, it also has a polishing function for polishing and removing fine cracks, rough surfaces, and uneven wear on the rolling mill roll, extending the roll replacement period by removing metal welds and heat cracks from the rolling mill roll surface. effective. Moreover, since it can install instead of the conventional draining wiper, there is no restriction of installation space and the initial cost can be reduced. In this way, by combining the new abrasive with the draining wiper that prevents the rolling mill roll cooling water that is normally used in the rolling mill from being applied to the rolled steel sheet, the roll rotation motion during operation is utilized. The surface deterioration of the rolling mill roll can be polished and removed while draining the cooling water. Further, space saving and cost reduction can be achieved by integrating the draining wiper and the abrasive.

In particular, according to claim 2, a polishing resin laminate molding in which abrasive grains are uniformly dispersed in a nonwoven fabric on one side of a fabric-based thermosetting resin laminate in which a prepreg impregnated with a thermosetting resin is impregnated into a woven fabric. Adhering the plate, and the surface of the polishing resin laminate molded plate is laminated with a draining pad material made of resin impregnated felt or non-woven fabric, giving high mechanical strength to the cloth-based thermosetting resin laminate Is done.

  According to claim 3, the polishing resin laminate molded plate is formed by impregnating a nonwoven fabric with abrasive grains, in which an abrasive filler is attached to the nonwoven fabric, into a prepreg by impregnating a thermosetting resin varnish, and laminating a plurality of the prepregs. Thus, the surface of the rolling mill roll can be uniformly polished because the abrasive grains are uniformly dispersed by pressure and heat molding.

  According to claim 4, the polishing resin laminated molded plate is formed of a thermosetting resin on a nonwoven fabric with abrasive grains in which an abrasive filler made of at least one of silicon carbide abrasive grains and alumina abrasive grains is adhered to the nonwoven fabric. A prepreg is impregnated with a varnish, wherein the non-woven fabric with abrasive grains is 60 to 90% by weight, the solid component of the thermosetting resin varnish is 10 to 40% by weight, and a plurality of the prepregs are laminated and added. Since it is formed by pressure heating, it is possible to provide an abrasive that exhibits a higher and more stable polishing effect than the prior art. Also, a method of spraying abrasive grains on a conventional woven cloth and then laminating and laminating them, or applying pressure and heat molding, or applying an adhesive mixed with abrasive grains to the woven cloth and laminating them Compared with the method of press-heating and molding, the abrasive grains can be uniformly dispersed throughout the laminated material at a high density. In these conventional methods, when abrasive grains such as alumina are filled in excess of 20% by weight with respect to the woven fabric, uniform dispersion cannot be achieved. However, in the present invention, the abrasive filler is uniformly distributed even at a filling amount of 40% by weight. It is possible to produce a stable polishing resin laminate molded product that is maintained in a dispersed state and is not excessively insufficient or insufficient.

  According to claim 5, since the non-woven fabric is made of polyamide resin, the polishing resin laminate molding plate has sufficiently high mechanical strength such as impact resistance of the polishing resin laminate molding, Since the thermosetting resin is excellent in abrasion resistance and is made of at least one resin selected from epoxies and phenols, it is possible to provide a polishing resin laminate molded product capable of withstanding sliding heat generation during polishing. The average particle diameter of the silicon carbide abrasive grains or alumina abrasive grains is 27 to 75 μm, and the nonwoven fabric is 36 to 54 wt% and the abrasive filler is 24 to 36 wt% with respect to the entire molded plate. Therefore, the polishing performance can be sufficiently exhibited and the abrasive grains are contained at a high density. As described above, the polishing resin laminated molded plate used in the present invention is resistant to chipping due to wear and impact caused by a long rolling operation, has a certain polishing effect, and has a dimensional change due to thermal expansion and water absorption. Because of the approximation, there is no fear of peeling even if combined with a draining pad material.

  According to claim 6, the draining pad material is prepared by impregnating a phenol resin varnish into a non-woven fabric made of felt or nylon fiber, polyester fiber, polypropylene fiber or meta-aramid fiber made of wool, Since it is laminated and pressure-heat-molded, it has a draining performance equivalent to that of a conventional draining wiper.

  According to the seventh aspect, the cloth-based thermosetting resin laminate is prepared by impregnating a woven cloth with a phenol resin varnish to produce a prepreg, and laminating the prepreg and press-molding it. Excellent mechanical properties such as impact and bending rigidity.

1 shows a maintenance wiper for steelmaking according to the present invention, wherein (a) is a simplified cross-sectional view of a steelmaking maintenance wiper having a two-layer structure of a polishing resin laminate molded plate and a draining pad material, and (b) is a cloth-based thermosetting resin laminate. It is a simplified sectional view of a maintenance wiper for steel making of a three-layer structure of a plate, a resin laminated molded plate for polishing, and a draining pad material. A comparative sample is shown, (a) is a simplified sectional view of a conventional draining wiper having a two-layer structure of a cloth-based thermosetting resin laminate and a draining pad material, and (b) is a simplified section of a wiper having a single material structure. FIG. It is a conceptual diagram of an abrasion tester. It is explanatory drawing for calculating the abrasion loss of a test piece. The principal part of the water permeation amount testing machine for evaluating draining performance is shown, (a) is a plan view, and (b) is a side view. In the case of using an abrasive made of silicon carbide abrasive grains, the amount of polishing on the roll surface is measured with a surface roughness measuring machine, and the polishing depth is calculated from the roughness distribution. (A) is before the test. (B) is a surface roughness curve after the test. Data obtained by measuring the amount of polishing on the roll surface with a surface roughness measuring machine and calculating the polishing depth from the roughness distribution when using a polishing material made of silicon carbide abrasive grains and setting the surface pressure to double. Yes, (a) is the surface roughness curve before the test, and (b) is the surface roughness curve after the test. Data obtained by measuring the amount of polishing on the roll surface with a surface roughness measuring machine and calculating the polishing depth from the roughness distribution when using a polishing material made of alumina abrasive grains and setting the surface pressure to 2 times. (A) is the surface roughness curve before a test, (b) is the surface roughness curve after a test.

  The present invention provides a steelmaking maintenance wiper provided with a polishing function for polishing a roll surface to a draining wiper that removes cooling water from a rolling mill roll for steelmaking. As shown in FIG. 1 (a), the steelmaking maintenance wiper A of the first invention is made of a resin-impregnated felt or a nonwoven fabric on the surface of a polishing resin laminate molded plate 1 in which abrasive grains are uniformly dispersed in the nonwoven fabric. The draining pad material 2 is laminated. In addition, the steelmaking maintenance wiper B of the second invention is a polishing resin in which abrasive grains are uniformly dispersed in a nonwoven fabric on one side of a cloth-based thermosetting resin laminate 3 as shown in FIG. 1 (b). The laminated molded plate 1 is bonded, and the draining pad material 2 made of resin-impregnated felt or nonwoven fabric is laminated on the surface of the polishing resin laminated molded plate 1.

Here, the polishing resin laminate molding plate 1 is formed by impregnating a non-abrasive nonwoven fabric with an abrasive filler attached to a non-woven fabric, impregnating a thermosetting resin varnish into a prepreg, and laminating a plurality of the prepregs. Prepare by thermoforming. More specifically, the polishing resin laminated molded plate 1 is an abrasive in which an abrasive filler made of at least one of silicon carbide (SiC) abrasive grains and alumina (Al ₂ O ₃ ) abrasive grains is adhered to a nonwoven fabric. A non-woven fabric with grains is impregnated with a thermosetting resin varnish to form a prepreg, wherein the non-woven fabric with abrasive grains is 60 to 90 wt%, and the solid component of the thermosetting resin varnish is 10 to 40 wt%. A plurality of the prepregs are laminated and press-heated and formed. Here, the polishing resin laminate molding plate 1 is such that the nonwoven fabric is made of a polyamide resin, the thermosetting resin is made of at least one resin selected from epoxies and phenols, and the silicon carbide abrasive The average particle diameter of the grains or alumina abrasive grains is 27 to 75 μm, and the non-woven fabric is 36 to 54 wt% and the abrasive filler is 24 to 36 wt% with respect to the entire molded plate. In the aforementioned nonwoven fabric with abrasive grains, the weight ratio of the nonwoven fabric to the abrasive filler is 60:40. And the molding pressure of the said resin laminated molding 1 for grinding | polishing has adjusted the density so that it may become the range of 0.7-1.5 g / cm < ³ >.

  Here, it is preferable that the nonwoven fabric is made of a polyamide resin, and the thermosetting resin is made of at least one resin selected from epoxies and phenols. As the abrasive grains, not only alumina and silicon carbide, but also diamond grains and cubic boron nitride grains can be used.

  The draining pad material 2 is prepared by impregnating a non-woven fabric made of felt or nylon fiber, polyester fiber, polypropylene fiber or meta-aramid fiber made of wool with a phenol resin varnish, and laminating the prepreg. It is pressure-heat-molded.

  The cloth-based thermosetting resin laminate 3 is obtained by impregnating a woven fabric with a phenol resin varnish to produce a prepreg, and laminating the prepreg and press-molding it.

  A conventional draining wiper C has a two-layer structure in which the draining pad material 2 is bonded to one side of a cloth-based thermosetting resin laminate 3 as shown in FIG. Note that FIG. 2B shows a wiper D having a single material structure manufactured for comparison.

First, the manufacturing method of the resin laminated molding board (abrasive material) 1 for polishing used in the present invention is shown below. After preparing the raw materials,
1. 1. Preparation of varnish formulation 2. Impregnation of substrate 3. Solvent removal 4. Pre-drying / curing 5. Thermoforming After completion of the material, a resin laminate molded plate in which abrasive grains are uniformly dispersed is obtained. The molded product is machined and trimmed to the final part shape.

  Further, each manufacturing process will be described in detail.

Here, the raw materials used are a base material, a varnish, and a solvent.
Base material: Non-woven fabric of polyamide resin fiber; weight 7000 g / m ² ± 700 g
Contains 40% by weight of abrasive grains (filler) ・ Varnish: Resol-type or novolac-type phenolic resin ・ Solvent: Methanol (first grade)

1. Preparation of varnish A varnish prepared by dissolving a predetermined amount of phenol resin in methanol is prepared. The preparation method is as follows. Put the required amount of methanol in the container and set the stirrer. Next, stirring is started at a speed of about 100 rpm, and the same amount of novolak type phenolic resin as methanol is slowly added at a rate of 1 kg / min. Then, stirring is performed for 30 minutes at a speed of 200 rpm, and it is confirmed that the aggregation of the resin is eliminated.

2. Impregnation into abrasive base material A base material (nonwoven fabric with abrasive grains) is impregnated with a phenol resin varnish to prepare a prepreg as a raw material for a resin laminate molded plate for polishing. The blending amount of the prepreg is 60 to 90% by weight for the base material and 10 to 40% by weight for the phenol resin varnish, and the base material is uniformly impregnated with the phenol resin varnish. As a nonwoven fabric with abrasive grains, a nonwoven fabric in which abrasive grains are uniformly adhered in advance is used. Here, when the coating amount of the phenol resin varnish is less than 10% by weight, adhesion failure occurs due to insufficient resin, and when it exceeds 40% by weight, the outflow of molten resin at the time of heat molding increases, resulting in failure due to base material deformation. To do. Preferably, the coating amount of the phenol resin varnish is 20 to 30% by weight with respect to the prepreg.

3. Solvent removal The prepreg is put into a hot air circulating furnace set at 100 ° C. for about 1 hour to remove the solvent.

4). Pre-drying / curing Immediately before molding, the prepreg is put into a hot air circulating furnace set at 100 ° C. for 2 hours to remove moisture absorbed and pre-curing the resin.

5. Heat forming A plurality of prepregs that have been pre-dried / cured are stacked and formed by hot pressing. The adjustment of the thickness of the polishing resin laminated molded plate 1 is roughly adjusted by the number of laminated prepregs, and the fine adjustment is performed by cutting to obtain a predetermined thickness.

Moreover, when using an epoxy resin instead of a phenol resin, the following materials are mixed and an epoxy resin varnish is prepared.
Epoxy resin ・ ・ Bisphenol A type epoxy resin Hardener ・ ・ ・ Amine hardener (equivalent to resin)
Solvent: MEK (for varnish preparation)
The process of producing a polishing resin laminate molded plate using this epoxy resin varnish is the same as that of the above-mentioned phenol resin base.

Table 1 below shows the hot press forming conditions.

  Next, the manufacturing method of the said draining pad material 2 is demonstrated. The draining pad material 2 was prepared by impregnating a non-woven fabric with a phenol resin varnish to prepare a prepreg, and then laminating the prepreg to form a sheet. The draining pad material 2 has a composition of 70% by weight of nonwoven fabric and 30% by weight of phenol resin in this embodiment.

  Finally, a method for manufacturing the cloth-based thermosetting resin laminate 3 will be described. The cloth-based thermosetting resin laminate (phenolic resin laminate) 3 is made of cotton cloth as a base material and uses phenol resin as a binder. The cloth is 55 wt% cotton cloth and 45 wt% phenol resin. A phenol resin varnish was applied to prepare a prepreg, which was laminated and pressure-heated and formed.

  The test piece of Example 1 has the laminated structure shown in FIG. 1A, and is formed by adhering a draining pad material 2 to one side of a polishing resin laminated molded plate 1. As shown in FIG. 1B, the test piece of Example 2 is obtained by bonding a polishing resin laminate molding plate 1 and a draining pad material 2 to a cloth-based thermosetting resin laminate 3 as a base material. It is. As shown in FIG. 2A, the test piece of Comparative Example 2 is obtained by adhering a draining pad material 2 to a cloth-based thermosetting resin laminate 3 as a base material. As shown in FIG. 2B, the test pieces of Comparative Examples 1, 3, and 4 are only the polishing resin laminated molded plate 1 (Comparative Example 1) and only the cloth-based thermosetting resin laminated plate 3 (Comparative Example). 3) Or a single material structure consisting of only a resinoid grindstone (Comparative Example 4).

  The test pieces of Examples 1 and 2 and Comparative Example 2 were prepared by applying a predetermined amount of an adhesive to those prepared by press-heating and molding each material. Any adhesive may be used as long as it has impact resistance, water resistance, and a heat resistance temperature of about 80 ° C. In this example, a phenol resin adhesive was used to prepare the sample piece.

  Each of the polishing resin laminated molded plates 1 of Examples 1 and 2 and Comparative Example 2 uses a polyamide resin fiber nonwoven fabric as a base material, a phenol resin as a binder, and silicon carbide abrasive grains # as abrasive grains (filler). 320, a polyamide resin fiber nonwoven fabric and an abrasive filler were blended at a weight ratio of 60:40, and a phenol resin blended with 30% by weight based on the entire molded product (manufactured by Starlight Kogyo Co., Ltd.). # 19901). The average grain size of the abrasive grain # 320 defined by JIS R6001 is 40 ± 2.5 μm, which is 27 μm or more. The mechanical strength of the polishing resin laminate molding plate 1 is about 60% of that of the cloth-based thermosetting resin laminate (phenolic resin laminate) 3, but a sufficient thickness is ensured and appropriately held. It can be said that if it is attached to a member, it has mechanical strength that can withstand practical use.

<Polishing performance evaluation test>
The polishing performance evaluation test of each test piece thus obtained was performed. The test method is to test a test piece (length 75 mm, width 20 mm, thickness 10 mm) processed into the shape shown in FIGS. 1 and 2 under the test conditions shown in Table 2 using the wear tester shown in FIG. And the amount of wear of the test piece after sliding and the counterpart material roll is measured. Here, as shown in FIG. 3, the wear tester rotates the columnar mating material roll 4 at a predetermined rotational speed with the rotating shaft of the mating material roll 4 in a horizontal position so as to oppose the peripheral surface of the mating material roll 4. The test piece 7 is attached to the tip of an arm 6 pivotally supported on one end of the fixed support 5 so as to be pivotable up and down, and the tip of the test piece 7 is brought into contact with the peripheral surface of the counterpart roll 4 from above. The contact pressure is adjusted by a weight 8 suspended in the middle of the arm 6.

The counterpart material roll 4 has a diameter of 100 mm, a material of FC20, and a peripheral surface finished to a surface roughness Ra = 3 μm. The rotational speed was 1000 m / min at the peripheral speed, and the operation was continued until the sliding distance reached 480 km. The contact pressure (linear pressure) between the test piece and the counterpart roll is 280 gf / cm, which is unlubricated.
(1) Roll wear height (polishing depth)
The test was performed with the above-described wear tester assuming roll polishing, and the amount of polishing of the roll surface before and after the test was measured with a surface roughness measuring machine, and data obtained by calculating the wear height from the roughness distribution was obtained ( Radius base, unit: μm). The polishing effect is evaluated by the roll wear height.
(2) Abrasive wear amount The abrasive wear amount was tested with the above-described wear tester, and the wear of the test pieces before and after the test (Examples 1-2 and Comparative Examples 1-4) as shown in FIG. Is the data showing the amount of change in terms of volume (unit: mm ³ ). The hatched lines in FIG. 4 indicate the wear part 9, and the volume is the wear amount. That is, the amount of wear = A × B × 1/2 × the width of the test piece. The abrasion resistance is evaluated based on the abrasive wear amount.

<Water permeation test>
The water drainage performance was evaluated using a water permeation amount tester as shown in FIG. The water permeation amount tester is the same as the above-described wear tester, wherein water leakage prevention seals 10 and 10 are provided on both sides of the tip of the test piece 7 to stop water between the outer peripheral surface of the counterpart material roll 4 and the test. Water is dropped at a rate of 1 g / min into a recess formed by the tip of the piece 7 and both the water leakage prevention seals 10, 10 and the outer peripheral surface of the counterpart material roll 4. The permeated water 12 that passes through the contact surface with the outer peripheral surface of the counterpart material roll 4 and falls down along the outer peripheral surface of the counterpart material roll 4 is received by the container 13 and evaluated by the amount of water accumulated in the harmful container 13. It is.

  In the following Table 3, the polishing performance evaluation test result and the water permeation amount test result for each test piece are shown. The evaluation criteria are in three stages: ○: good, Δ: slightly inferior, x: inferior. Since Comparative Example 4 has no drainage performance, it can be expected that the polishing effect and the wear resistance are excellent. However, since the damage to the counterpart material roll 4 is too great, no wear experiment was conducted.

  As the results in Table 3 show, Examples 1 and 2 are “good” in terms of polishing effect, abrasion resistance, and drainage performance. On the other hand, Comparative Example 1 was composed of only the polishing resin laminate molding plate, so that the polishing effect and abrasion resistance were naturally “good”, but the draining performance was “slightly inferior”. Moreover, since the comparative example 2 is the structure of the conventional draining wiper itself, the draining performance was “good”, but there was no polishing effect. The wear resistance of Comparative Example 2 was determined to be “good” because it had a relatively large amount of wear but withstands practical use. The wear amounts of Examples 1 and 2 were also similar to those of Comparative Example 2, and thus the wear resistance was determined as “good”. Moreover, since the comparative example 3 is a phenol resin laminated material itself, the abrasion resistance was “good”, but there was no polishing effect and the draining performance was “slightly inferior”. Overall, the maintenance wiper for steelmaking of the present invention has a draining performance comparable to that of a conventional draining wiper, a function of polishing a rolling mill roll, and a durability that can withstand use. It was.

  Since the maintenance wiper for steelmaking according to the present invention has a polishing function for the draining wiper, the surface pressure against the rolling mill roll is the same between the polishing resin laminated molded plate 1 and the draining pad material 2, and the draining wiper It is important that a polishing effect can be obtained under the contact conditions being implemented. Therefore, test pieces each consisting only of a polishing resin laminate molded plate 1 using silicon carbide abrasive grains and alumina abrasive grains were respectively prepared, and first, test pieces in which silicon carbide abrasive grains were dispersed and filled were used. A polishing test was performed under the test conditions of 4 (load: 280 gf / cm), the polishing amount of the roll surface was measured with a surface roughness measuring machine, and data obtained by calculating the polishing depth from the roughness distribution was obtained. The results are shown in FIG. 6, where (a) is the surface roughness curve before the test, (b) is the surface roughness curve after the test, and the polishing depth is about 5 μm. Next, a similar polishing test was performed under the test conditions in which only the load was set to double 560 gf / cm, and the results are shown in FIG. FIG. 7A shows a surface roughness curve before the test, FIG. 7B shows a surface roughness curve after the test, and the polishing depth was about 6 μm. From the above, it can be seen that the polishing performance of the polishing resin laminated molded plate 1 used in the present invention is that the polishing depth hardly changes even when the load changes twice, that is, it does not depend on the contact surface pressure. It was confirmed that the polishing effect can be sufficiently exhibited even under contact conditions suitable for exhibiting performance.

  FIG. 8 shows a result of a similar polishing test conducted under test conditions with a load set at 560 gf / cm, using a test piece composed only of a polishing resin laminate molded plate 1 in which alumina abrasive grains are dispersed and filled. Show. FIG. 8 shows data obtained by measuring the polishing amount of the roll surface with a surface roughness measuring machine and calculating the polishing depth from the roughness distribution. (A) is the surface roughness curve before the test, (b) is It is a surface roughness curve after a test. The polishing depth in this case was about 7 μm.

  Finally, some production examples of the resin laminate molded plate 1 for polishing are shown in Table 5, and the results of polishing tests using the respective abrasives are also shown. The test conditions here are those listed in Table 2.

  Abrasives 1-10 are all based on a polyamide resin fiber nonwoven fabric, abrasives 1-6, 9, and 10 are phenolic resins as binders, and abrasives 7 and 8 are epoxy resins. As abrasive grains (fillers), abrasives 1-4, 7, 9, and 10 are silicon carbide abrasive grains # 320, abrasive material 5 is silicon carbide abrasive grains # 220, and abrasive materials 6 and 8 are alumina abrasive grains # 320. Is used. Moreover, the abrasives 1-10 are all blended with a polyamide resin fiber nonwoven fabric and an abrasive filler in a weight ratio of 60:40, and in the abrasives 1-8, the phenolic resin and the epoxy resin are respectively for the entire molded product. 30% by weight was blended. In the abrasive 9, 10% by weight of the phenol resin was blended with respect to the entire molded product, and in the abrasive 10, the phenol resin was blended in 40% by weight with respect to the entire molded product. Here, the counts of the abrasive grains are defined by JIS R6001, and two types of # 220 (average particle size of 75 to 45 μm) and # 320 (average particle size of 40 ± 2.5 μm, minimum particle size of 27 μm or more) are used. doing.

  That is, in the abrasives 1 to 5, the polyamide resin fiber nonwoven fabric is 42% by weight, the silicon carbide abrasive grains are 28% by weight, and the phenol resin is 30% by weight. In Example 6, it is 42 weight% of polyamide resin fiber nonwoven fabric, 28 weight% of alumina abrasive grains, and 30 weight% of phenol resin. In the abrasive 7, the polyamide resin fiber nonwoven fabric is 42% by weight, the silicon carbide abrasive grains are 28% by weight, and the epoxy resin is 30% by weight. In Example 8, it is 42 weight% of polyamide resin fiber nonwoven fabric, 28 weight% of alumina abrasive grains, and 30 weight% of epoxy resin. In the abrasive 9, it is 54 weight% of polyamide resin fiber nonwoven fabric, 36 weight% of silicon carbide abrasive grains, and 10 weight% of phenol resin. In the abrasive 10, the polyamide resin fiber nonwoven fabric is 36% by weight, the silicon carbide abrasive grains are 24% by weight, and the phenol resin is 40% by weight. Moreover, abrasives 1-4 changed the density by changing the molding pressure.

  The evaluation criteria in Table 5 are the values of the amount of polishing and the amount of wear of the composition with the knowledge of the effect (abrasive material 3). Compared with this good abrasive 3, the amount of polishing of the counterpart roll and the amount of wear of the test piece Compare The evaluation is that ◎ is very good, ○ is excellent, Δ is normal, and X is inferior.

  From the results shown in Table 5, the abrasives 1 to 10 can be used for practical use by comprehensively evaluating the polishing effect and wear resistance, and the abrasives 2, 3 and 5 are particularly excellent, The abrasives 7 and 8 are excellent. The abrasive 1 has a small polishing effect and a relatively large amount of wear. Further, the abrasives 4 and 6 are particularly excellent in the polishing effect, but the wear amount is increased. These abrasives are designed on the assumption that they are in contact with a rolling mill roll for a long time during online operation, and can sufficiently withstand practical use.

DESCRIPTION OF SYMBOLS 1 Polishing resin laminated molding board 2 Draining pad material 3 Cloth-based thermosetting resin laminated board 4 Opposite material roll 5 Support base 6 Arm 7 Test piece 8 Weight 9 Wear part 10 Water leak prevention seal 11 Dripping water 12 Permeated water 13 container

Claims (7)

  A steelmaking maintenance wiper having a polishing function for polishing the roll surface to a draining wiper that removes cooling water from a rolling mill roll for steelmaking, and a polishing resin laminated molding plate in which abrasive grains are uniformly dispersed in a nonwoven fabric A steel-made maintenance wiper, wherein a water draining pad material made of resin-impregnated felt or non-woven fabric is laminated on the surface of the steel. This is a steelmaking maintenance wiper equipped with a polishing wiper that removes cooling water from a rolling mill roll for steelmaking, and a polishing function for polishing the roll surface, and is a cloth base in which a prepreg impregnated with a thermosetting resin is laminated on a woven cloth A polishing resin laminate molding plate in which abrasive grains are uniformly dispersed in a nonwoven fabric is adhered to one side of the thermosetting resin laminate plate, and the surface of the polishing resin laminate molding plate is made of a resin-impregnated felt or a nonwoven fabric. A maintenance wiper for steelmaking, characterized in that draining pad material is laminated.   The polishing resin laminate molding plate is a prepreg obtained by impregnating a non-woven fabric with abrasive grains having an abrasive filler adhered to the non-woven fabric, impregnated with a thermosetting resin varnish, and a plurality of the prepregs are laminated and pressure-heat-molded. The maintenance wiper for steel making according to claim 1 or 2, wherein the abrasive grains are uniformly dispersed.   The polishing resin laminate molded plate is a prepreg obtained by impregnating a non-woven fabric with abrasive grains in which an abrasive filler made of at least one of silicon carbide abrasive grains and alumina abrasive grains is adhered to the non-woven cloth and impregnating a thermosetting resin varnish. Here, the non-woven fabric with abrasive grains is 60 to 90% by weight, the solid component of the thermosetting resin varnish is 10 to 40% by weight, and a plurality of the prepregs are laminated and pressure-heat-molded. The steelmaking maintenance wiper according to claim 3.   In the polishing resin laminate molded plate, the nonwoven fabric is made of a polyamide resin, the thermosetting resin is made of at least one resin selected from epoxies and phenols, and the silicon carbide abrasive grains or alumina abrasives The steelmaking according to claim 4, wherein the average particle size of the grains is 27 to 75 µm, the non-woven fabric is 36 to 54% by weight, and the abrasive filler is 24 to 36% by weight with respect to the entire molded plate. Maintenance wiper.   The draining pad material is made of wool felt or nylon fiber, polyester fiber, polypropylene fiber, or meta-aramid fiber, impregnated with a phenol resin varnish to produce a prepreg, and then laminated and pressure-heat molded. The maintenance wiper for steel making according to claim 1 or 2.   3. The maintenance wiper for steel making according to claim 2, wherein the cloth-based thermosetting resin laminate is prepared by impregnating a woven fabric with a phenol resin varnish to produce a prepreg, and laminating the prepreg and press-molding it.