JP2018122371A - Coating film polishing device and die steel material processing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating film polishing device which can polish a coating film, such as a shop primer, of a welding portion of a die steel material when a long die steel material such as an L shaped die steel material is moved and inhibit occurrence of welding defects in welding at a subsequent process, and to provide a die steel material processing system, a coating film polishing method, and a die steel material processing method.SOLUTION: A coating film polishing device includes a first surface brushing device 11a and a second surface brushing device 11b with brushes 11ab, 11b which can contact with corner parts of an end surface 32C of a long die steel material and flat surfaces 32A, 32B which are adjacent to the end surface 32C while rotating. The coating film polishing device is formed provided with a surface brush interval change mechanism which can change a mutual distance D1 between a tip part of the brush 11ab of the first surface brushing device 11a and a tip part of the brush 11bb of the second surface brush device 11b.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a coating film polishing apparatus, a mold steel material processing system, a coating film polishing method, and a mold steel material processing method that can suppress the occurrence of welding defects caused by polishing and removing a coating film such as a shop primer of a mold steel material.

  In the shipbuilding industry, welding work is performed in which long steel molds are welded as reinforcements to the hull skins and bulkheads, and these long steel molds are received by shot blasting equipment. After removing the rust of the mold steel, the shop primer coating device is used to coat the shop primer (primary rust preventive primer) such as an inorganic zinc primer anticorrosive paint as a temporary anticorrosion to suppress the generation of rust during the process. doing. Further, the printing device prints information such as the use and location of use of the shape steel material, and then cuts it to a required length by the cutting device to produce a frame shape steel material.

  However, this type steel material is assembled by welding to a flat plate such as a hull outer plate or a partition wall, but if the shop primer painted at the time of welding is thick and welding is performed, it causes a welding defect. And when the thickness of this shop primer is about 10 micrometers-15 micrometers or more, it exists in the tendency for a welding defect to generate | occur | produce easily, so that thickness is thick. Therefore, the welding surface of the end part of the shape steel material is polished manually by using a grounder so that the film thickness of the shop primer is not more than an appropriate thickness. Therefore, there is a problem that it takes a lot of time and work efficiency is poor.

  In particular, when the shape steel material is an L-shaped steel material, the end portion of the plate member having a cross-sectional shape and a large width is assembled in contact with the flat plate to be welded. Becomes the welding surface. On the other hand, when the shop primer is applied by a shop primer coating device while the L-shaped steel is transported so that the upper side is convex with a roller or the like, the shop primer flowing down along the plane of the L-shaped steel material is welded as described above. It tends to accumulate at the edge where it will be thickened.

  In this connection, although it is not a shop primer, the size of the device is increased by using a rotating brush that rotates and revolves the brush shaft in order to burr and deburr metal products, and to polish and remove paint. In addition, a deburring and polishing / coating peeling device that can reduce the complexity and eliminate manual work and prevent the brush hairs from being entangled with each other has been proposed (for example, see Patent Document 1).

  However, in this deburring and polishing / coating peeling apparatus, only one surface is polished, and the thickness of the shop primer for the welded portion consisting of the end surface of the mold steel material and the flat surfaces on both sides thereof is within a preset range. For example, in the case of an L-shaped steel material, the shorter width is about 100 mm, the longer width is about 350 mm, and the thickness is about 12 mm / 17 mm (an unequal thickness angle material). When the weight is about 45.3 kg / m and the direction is changed, there is a problem that the tipping device or the tipping mechanism of this type steel material becomes very large.

JP 2004-142059 A

  The present invention has been made in view of the above situation, and its purpose is to provide a coating film such as a shop primer on a welded portion of the long steel material such as an L-shaped steel material while moving the long steel material. An object of the present invention is to provide a coating film polishing apparatus, a mold steel material processing system, a coating film polishing method, and a mold steel material processing method that can be polished and can suppress the occurrence of welding defects in a welding operation in a subsequent process.

  In order to achieve the above object, a coating film polishing apparatus of the present invention is a coating film polishing apparatus for polishing a coating film at a corner of an end face of a long shaped steel material, and is adjacent to the end face of the die steel material. A brushing device for a first surface and a brushing device for a second surface that can contact the brush while rotating on each of the planes; a tip of the brush of the brushing device for the first surface; and a brushing device for the second surface A brush inter-surface distance changing mechanism is provided that enables the mutual distance between the brush tip portions to be changed.

  According to this configuration, the planar portions on both sides of the welded portion of the mold steel material can be polished at the same time, and the tip end portion of the brush of the first surface brushing device follows the thickness of the mold steel material and the thickness of the coating film. The mold is sandwiched between the brush of the first surface brushing device and the brush of the second surface brushing device by changing and finely adjusting the mutual distance between the tip of the brush of the second surface brushing device and the second surface brushing device. The thickness of the coating film at the end portion of the steel material can be set to a thickness that optimizes the balance between the antirust effect and the effect of preventing the occurrence of weld defects during welding. Further, the inspection and replacement of the brush can be facilitated by increasing the mutual distance between the tip of the brush of the first surface brushing device and the tip of the brush of the second surface brushing device.

  In the coating film polishing apparatus, the above effect is particularly great when the coating film is a shop primer.

  In the coating film polishing apparatus, an inclination sensor that detects an inclination of the end face or the plane of the die steel material, a brush of the first surface brushing apparatus and the brush so as to match the inclination detected by the inclination sensor If the brush inclining mechanism for the surface that inclines both the brushes of the brushing device for the second surface is provided, the welded part will be polished depending on the type and size of the steel plate that moves on the moving surface such as the roller. Since the first surface brushing device brush and the second surface brushing device brush can be inclined at the same time according to the degree of inclination, the type and size of the shape steel material can be easily changed. Can follow.

  In the coating film polishing apparatus described above, an end face brushing device capable of contacting the end face while rotating the brush is provided, and an end face capable of changing the distance of the tip of the brush of the end face brushing apparatus to the end face When the brush moving mechanism is provided, not only the two surfaces on both sides of the welded portion of the mold steel material but also the end surfaces can be polished, so that the occurrence of welding defects can be further prevented during the welding of the mold steel material.

  In the above coating film polishing apparatus, when the end surface brush inclination mechanism for inclining the brush of the end surface brushing apparatus is provided so as to match the inclination detected by the inclination sensor, the pattern steel material to be polished is provided. Since the brush of the first surface brushing device and the brush of the second surface brushing device can be simultaneously inclined according to the degree of inclination, it becomes possible to easily follow the change in the type and size of the shape steel material.

  In the above coating film polishing apparatus, regardless of the mutual distance between the tip of the brush of the first surface brushing device and the tip of the brush of the second surface brushing device, for the first surface When the pressing force for pressing each brush in the brushing device and the second surface brushing device against the flat surface is set to a constant pressing force, the types and dimensions of the steel shapes are different. On the other hand, the optimum coating amount of the coating film, in other words, the thickness of the remaining coating film can be made substantially constant without changing the moving speed of the mold steel and the number of rotations of the brush. In addition, as a mechanism which makes this pressing force constant, it can comprise easily by employ | adopting and pressing an air cylinder and making the air pressure supplied to an air cylinder into a constant pressure.

  Moreover, the mold steel processing system for achieving said objective is comprised by providing said primer grinding | polishing apparatus in the conveying apparatus which moves the said mold steel. And according to this structure, the same effect as said primer polishing apparatus can be exhibited.

  In addition, the mold steel material processing system for achieving the above-mentioned object comprises a shot blasting device, a shop primer coating device, a printing device, and a cutting device. Printing of various information, polishing for adjusting the thickness of the shop primer, and cutting of the steel mold can be performed.

  Moreover, the coating film polishing method of the present invention for achieving the above object is a coating film polishing method for polishing a coating film at a corner of an end face of a long shaped steel material. By changing the mutual distance between the tip of the brush and the tip of the brush of the second surface brushing device, the brush of the first surface brushing device and the second of each of the planes adjacent to the end surface of the mold steel It is a method characterized in that the coating film at the corner is polished by abutting and rotating a brush of a surface brushing device.

  According to this method, the planar portions on both sides of the welded portion of the mold steel material can be polished at the same time, and the tip of the brush of the first surface brushing device follows the thickness of the mold steel material and the thickness of the coating film. By changing the mutual distance between the tip of the brush and the brush of the second surface brushing device and finely adjusting it, the thickness of the coating on the welded part of the die steel material is reduced and the weld defects are generated during welding. A thickness that optimizes the balance of both prevention effects can be achieved. Also, by increasing this mutual distance, the brush can be easily inspected and replaced.

  Moreover, the die steel material processing method of the present invention for achieving the above object includes a step of shot blasting a long shape steel material, a step of coating a shop primer on the die steel material, and a step of printing on the die steel material And a method of adjusting the thickness of the shop primer of the steel mold material using the coating film polishing method, and a process of cutting the steel mold material. By this method, it is possible to perform rust removal of the steel mold, coating of the shop primer, printing of various information, polishing for adjusting the thickness of the shop primer, and cutting of the steel mold.

  According to the coating film polishing apparatus, the die steel material processing system, the coating film polishing method, and the die steel material processing method of the present invention, while moving a long die steel material such as an L-shaped steel material, the shop of the welded portion of the die steel material is shopped. A coating film such as a primer can be polished, and the occurrence of welding defects can be suppressed in a welding operation in a subsequent process.

It is a side view which shows typically the structure of the coating-film polishing apparatus of embodiment which concerns on this invention, and is a figure which shows a part with the brushing apparatus for 1st surfaces, and the brushing apparatus for 2nd surfaces. It is a side view which shows typically the structure of the coating-film grinding | polishing apparatus of FIG. 1, and is a figure which shows a part with the brushing apparatus for end surfaces. It is explanatory drawing which shows typically the positional relationship of the brush of an L-shaped steel material, the brush of a coating-film grinding | polishing apparatus, and the conveying apparatus of a shape steel material processing system. It is explanatory drawing which expands and shows typically the positional relationship of the brush of the brush of the 1st surface brushing apparatus of FIG. 3, the brush of the brushing device for 2nd surfaces, and the brush of the brushing device for end surfaces. It is explanatory drawing which looked at the positional relationship of the brush of the brush of the 1st surface brushing device of FIG. 4, the brush of the brushing device for 2nd surfaces, and the brush of the brushing device for end surfaces from the longitudinal direction of the type | mold steel material. It is explanatory drawing which shows typically the component of the pattern steel material processing system of embodiment which concerns on this invention. It is explanatory drawing which shows typically the component of the type | mold steel material processing system of a comparative example.

  Hereinafter, a coating film polishing apparatus, a mold steel material processing system, a coating film polishing method, and a mold steel material processing method according to embodiments of the present invention will be described with reference to the drawings. Here, as an example of the coating film, while taking a shop primer having a large effect of the present invention as an example, as an example of a shape steel material, an L-shaped steel material having a large effect of the present invention will be described as an example. The coating film that is the subject of the present invention is not necessarily limited to the shop primer, and the shape steel material that is the subject of the present invention is not limited to the L-shaped steel material. It may be H-shaped steel material. In general, in the case of a flat steel plate (flat bar), the thickness of the coating film can be easily controlled, so that the necessity for uniforming by polishing is low.

  As shown in FIGS. 1 to 5, the coating film polishing apparatus 10 according to the embodiment of the present invention applies a coating film such as a shop primer at the corner of the end surface 32 c of a long steel material 30 such as an L-shaped steel material. The first surface brushing device 11a and the second surface, which are the coating film polishing device 10 for polishing, can be brought into contact with the flat surfaces 32A and 32B adjacent to the end surface 32C of the mold steel material 30 while the brushes 11ab and 11bb rotate. The brushing device 11b is provided. In addition, preferably, it is configured to include an end surface brushing device 11c capable of contacting the end surface 32C of the mold steel material 30 while rotating the brush 11cb.

  By means of the first surface brushing device 11a and the second surface brushing device 11b arranged so that the brushes 11ab, 11bb are opposed to each other, the portions of the planes 32A, 32B on both sides of the welded portion of the die steel material 30 at a time. Can be polished simultaneously. In addition, the end surface brushing device 11c can polish not only the two surfaces 32A and 32B on both sides of the welded portion of the die steel material 30 but also the end surface 32C, thereby preventing the occurrence of welding defects when welding the die steel material 30. become able to.

  Further, as shown in FIG. 5, the inter-surface brush distance that enables the mutual distance D1 between the front end portion of the brush 11ab of the first surface brushing device 11a and the front end portion of the brush 11bb of the second surface brushing device 11b to be changed. A change mechanism 12 is provided. As the surface brush distance changing mechanism 12, for example, a mechanism of a well-known technique for changing the distance between two members by a cylinder or a bar screw mechanism can be used.

  As shown in FIG. 5, this inter-surface brush distance changing mechanism 12 changes the mutual distance D1 slightly by following the thickness t of the die steel 30 and the thickness (not shown) of the coating film (not shown). Will be able to adjust. And thereby, the thickness of the coating film at the end portion of the die steel material 30 sandwiched between the brush 11ab of the first surface brushing device 11a and the brush 11bb of the second surface brushing device 11b is reduced to the rust prevention effect and welding. The thickness that optimizes the balance of both the effects of preventing the occurrence of welding defects at the time, for example, a shop primer, can be set to about a dozen μm or so. Further, by increasing the mutual distance D1, inspection and replacement of these surface brushing devices 11a and 11b are facilitated.

  Further, the end surface brush moving mechanism 13 that can change the distance D2 between the end surface 32C and the tip of the brush 11cb of the end surface brushing device 11c is provided. This end face brush moving mechanism 13 can also be easily configured by a cylinder or the like. Thereby, the thickness of the coating film on the end surface 32C of the die steel material 30 can be set to a thickness that optimizes the balance between the antirust effect and the effect of preventing the occurrence of weld defects during welding. In addition, the brush 11cb can be easily inspected and replaced by retracting the end face brushing device 11c greatly.

  In the configuration of FIGS. 1 and 2, the position of the inter-surface brush distance changing mechanism 12 having the first surface brushing device 11a and the second surface brushing device 11b is simultaneously B by the end surface brush moving mechanism 13. It can be moved in the direction. Such a configuration is more preferable because it requires only one configuration that moves in the B direction, and the structure of the mechanism for moving in the B direction is simplified. However, the configuration is not necessarily limited to this configuration, and the first-surface brushing device 11a and the second-surface brushing device 11b moving mechanism in the B direction and the end-surface brush moving mechanism 13 may be configured separately. . In the case of this configuration, the moving part is small and lightweight, and the surface brushes 11ab and 11bb and the end surface brush 11cb can be moved individually.

  Further, the inclination sensor 14a for detecting the inclination α of the end face 32C or the planes 32A and 32B of the steel plate 30 and the first surface brushing device 11a and the second surface so as to match the inclination α detected by the inclination sensor 14a. A surface brush tilting mechanism 14 for tilting the brushing device 11b is provided. The tilt sensor 14a can easily detect the tilt angle (ratio of tilt) α, for example, by detecting the rotation angle of the surface in contact with the plane 32A with an encoder or the like. Alternatively, the distance between the reference surface of the apparatus and the surface of the upper surface 32 of the die steel 30 is measured at two positions that are horizontally separated in a plane perpendicular to the moving direction A of the die steel 30. The inclination may be calculated from the difference.

  Thereby, the ratio of the short part 31 and the long part 32 changes with the kind and magnitude | size of the shape steel materials 30 which move the moving surfaces, such as the roller 21a of a conveying apparatus, and the plane 32A of the grinding | polishing object of a welding part changes. When the inclination of 32B is changed, the first surface brushing device 11a and the second surface brushing device 11b can be inclined at the same time according to the degree of the inclination α. Will be able to follow the changes.

  In the coating film polishing apparatus described above, when the end surface brush tilting mechanism 14 for tilting the brush 11cb of the end surface brushing device 11c is provided so as to match the tilt α detected by the tilt sensor 14a, the polishing is performed. The brush 11cb of the end surface brushing device 11c can be inclined according to the degree of the inclination α of the target mold steel material 30, and the tip surface of the brush 11cb of the end surface brushing device 11c is arranged in front of the end surface 32C to be uniform with high accuracy. Can be polished.

  1 and 2, the surface brush tilting mechanism 14 and the end surface brush tilting mechanism 14 are configured by the same mechanism. In such a configuration, since only one configuration that inclines in the α direction is sufficient, the structure is simplified, which is preferable. However, the surface brush tilt mechanism and the end surface brush tilt mechanism may be configured separately. . In the case of this configuration, the portion to be inclined is small and light, and the surface brushes 11a and 11b and the end surface brush 11c can be individually inclined.

  The rotation directions Rba and Rbc of the surface brushes 11a and 11b are rotated in the direction opposite to the moving direction A of the mold steel material 30, rather than rotating in the forward direction. This is more preferable because the relative speed of the contact portion is increased and polishing can be efficiently performed. Therefore, the rotation directions Rba and Rbc are the same direction.

  Furthermore, the diameters of the surface brushes 11ab and 11bb are preferably about 70 mmφ to 120 mmφ, and the area of the tip portion that contacts the die steel material 30 is preferably in the range of 30% to 70% of the total area of the tip portion. Furthermore, the range of 30% to 55% is more preferable.

  If it is smaller than this range, the force for pressing the brushes 11ab and 11bb is increased, and even if the convex portions of the coating film such as shop primer are polished and removed, the coating layer is continuously polished while the pressure is relatively high. End up. On the other hand, when the convex portion of the coating film is polished and removed when the area of the tip portion is in this range, the tip portion comes into contact with the coating film layer in a relatively wide range. , Even if the force for pressing 11bb is the same, the pressing force is dispersed and equalized over the entire contact surface, so that the action of further polishing and peeling the coating layer is drastically reduced. Accordingly, it is possible to avoid excessive polishing of the coating layer.

  Further, if it is larger than this range, the rotational force of the brushes 11ab and 11bb is increased, and wasteful energy is required. By setting this range, it becomes possible to polish efficiently.

  Similarly, the contact portion of the brush 11cb of the end surface brushing device 11c and the rotation direction are also shifted in the plate thickness direction from the center of the brush 11cb and the center of the end surface 32C. In addition, the rotation direction Rcb of the contacting portion and the moving direction A of the pattern steel material 30 are set to be opposite to each other.

  Further, the pressing force for pressing the brushes 11ab and 11bb in the first surface brushing device 11a and the second surface brushing device 11b against the flat surfaces 32A and 32B is set to the front end of the brush 11ab of the first surface brushing device 11a and the second surface brushing device 11a. Regardless of the size of the mutual distance D1 between the tips of the brushes 11bb of the two-surface brushing device 11b, the pressing force is set to a constant magnitude. As a mechanism for making this pressing force constant, it can be easily configured by adopting and pressing an air cylinder and making the air pressure supplied to the air cylinder constant.

  According to this configuration, even when the type and size of the die steel material 30 are different, the optimum coating amount of the coating film can be obtained without changing the moving speed of the die steel material 30 and the rotation speed of the brushes 11ab and 11bb. In other words, the thickness of the remaining coating film can be made substantially constant.

  In addition, the pressing force for pressing the brush 11cb on the end surface brushing device 11c against the end surface 32C is constant regardless of the distance D2 between the end surface 32C and the tip of the brush 11cb of the end surface brushing device 11c. Configure with pressing force. As a mechanism for making this pressing force constant, it can be easily configured by adopting and pressing an air cylinder and making the air pressure supplied to the air cylinder constant.

  According to this configuration, even when the type and size of the die steel material 30 are different, the optimum coating amount of the coating film, in other words, without changing the moving speed of the die steel material 30 and the rotational speed of the brush 11cb. The thickness of the remaining coating film can be made almost constant.

  As shown in FIG. 6, the mold steel material processing system 1 according to the embodiment of the present invention includes a moving system 21 including a moving roller 21 a that moves a mold steel material 30 such as an L-shaped steel material, and shot blasting. The apparatus 22, the shop primer coating apparatus 23, the coating film polishing apparatus 10, the printing apparatus 24, and the cutting apparatus 25 are provided. According to this structure, the same effect as said coating-film polisher 10 can be exhibited. And the rust removal of the type | mold steel material 30, application | coating of a shop primer, grinding | polishing, printing, and cutting | disconnection for the thickness adjustment of a shop primer can be performed.

  The coating film polishing method according to the embodiment of the present invention is a coating film polishing method for polishing a coating film at a corner portion of the end face 32C of the long L-shaped steel material 30, and includes a first surface brushing device 11a. By changing the mutual distance D1 between the front end of the brush 11ab and the front end of the brush 11bb of the second surface brushing device 11b, the first surface brushing device is provided on each of the planes 32A and 32B adjacent to the end surface 32C of the mold steel 30. In this method, the coating film is polished by rotating the brush 11ab of 11a and the brush 11bb of the second surface brushing device 11b in contact with each other.

  According to this method, the portions of the planes 32A and 32B on both sides of the welded portion of the mold steel material 30 can be polished at the same time, and the thickness t of the mold steel material 30 and the thickness of the coating film are tracked. By changing and finely adjusting the mutual distance D1 between the tip of the brush 11ab of the brushing device 11a and the tip of the brush 11bb of the second surface brushing device 11b, the thickness of the coating on the welded portion of the mold steel 30 is The thickness can be optimized to balance both the antirust effect and the effect of preventing the occurrence of weld defects during welding. Further, the inspection and replacement of the brushes 11ab and 11bb are facilitated by increasing the mutual distance D1.

  Moreover, the die steel material processing method of embodiment of this invention uses the process of shot-blasting the long shape steel material 30, the process of coating a shop primer on the die steel material 30, and said coating-film grinding | polishing method, It is a method characterized by including a step of adjusting the thickness of the shop primer of the mold steel material 30, a step of printing on the mold steel material 30, and a step of cutting the mold steel material 30. By this method, it is possible to perform rust removal of the steel plate 30, application of a shop primer, polishing, printing, and cutting for adjusting the thickness of the shop primer.

  Therefore, according to the coating film polishing apparatus 10, the mold steel material processing system 1, the coating film polishing method, and the mold steel material processing method having the above-described configuration, during the movement of the long mold steel material 30, A coating film such as a shop primer can be polished, and the occurrence of welding defects can be suppressed in a welding operation in a later process.

DESCRIPTION OF SYMBOLS 10 Coating-film polisher 11a 1st surface brushing apparatus 11b 2nd surface brushing apparatus 11c End surface brushing apparatus 11ab, 11bb, 11cb Brush 12 surface inter-brush distance changing mechanism 13 End surface brush moving mechanism 14 End surface brush inclination mechanism 14a Inclination sensor 21 Movement system 21a Roller 22 Shot blasting device 23 Shop primer coating device 24 Printing device 25 Cutting device 30 Flat steel 32A, 32B Plane adjacent to end surface 32C End surface A Direction of movement of type steel B Movement direction D1 of brushing device Mutual distance D2 between the tip of the brush of the first surface brushing device and the tip of the brush of the second surface brushing device Distance between the tip of the brush of the brushing device for the end surface relative to the end surface Rba, Rbc, Rbc Brush rotation Direction t Type steel thickness α End face or The slope of the surface

Claims (10)

A coating film polishing apparatus for polishing a coating film at a corner of an end face of a long shaped steel material,
The first surface brushing device includes a first surface brushing device and a second surface brushing device that can be contacted while rotating the brush on each of the planes adjacent to the end surface of the mold steel material, and the tip of the brush of the first surface brushing device And a brush surface distance changing mechanism for changing the distance between the brush tips of the second surface brushing device.   The coating film polishing apparatus according to claim 1, wherein the coating film is a shop primer.   An inclination sensor for detecting the inclination of the end face or the plane of the steel plate, and the brush of the first surface brushing device and the brush of the second surface brushing device so as to match the inclination detected by the inclination sensor The coating film polishing apparatus according to claim 1, further comprising a surface brush tilting mechanism that tilts both of the surfaces.   An end surface brushing device capable of contacting the end surface while rotating the brush is provided, and an end surface brush moving mechanism capable of changing the distance of the tip of the brush of the end surface brushing device to the end surface is provided. The coating film polishing apparatus according to any one of claims 1 to 3, wherein the apparatus is a coating film polishing apparatus.   5. The coating film polishing apparatus according to claim 4, further comprising an end surface brush tilting mechanism configured to tilt the brush of the end surface brushing device so as to match the tilt detected by the tilt sensor.   Regardless of the size of the mutual distance between the tip of the brush of the first surface brushing device and the tip of the brush of the second surface brushing device, the brushing device for the first surface and the second surface The coating film polishing apparatus according to any one of claims 1 to 5, wherein a pressing force for pressing each brush in the brushing device against the flat surface is set to a certain pressing force.   A die steel material processing system, wherein the coating device for moving a die steel material is provided with the coating film polishing apparatus according to any one of claims 1 to 6.   The die steel material processing system according to claim 6, further comprising a shot blasting device, a shop primer coating device, a printing device, and a cutting device. A coating film polishing method for polishing a coating film at a corner of an end face of a long shaped steel material,
The first surface brushing is applied to each of the planes adjacent to the end surface of the mold steel material by changing the mutual distance between the tip of the brush of the first surface brushing device and the tip of the brush of the second surface brushing device. A coating film polishing method, comprising: contacting a brush of an apparatus and a brush of the second surface brushing apparatus, and rotating each brush to polish the coating film at the corner portion.   A step of shot blasting a long shaped steel material, a step of coating a shop primer on the die steel material, a step of printing on the die steel material, and using the coating film polishing method according to claim 9, A die steel material processing method comprising a step of adjusting a thickness of a shop primer and a step of cutting the die steel material.

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