JP2020032336A - Wiper - Google Patents

Abstract

To provide a wiper that can secure adhesiveness between a slide part and a surface to be cleaned even if fastening torque of a bolt is excessive when the wiper is mounted on an object.SOLUTION: A wiper 1 comprises a mounting part 2 to be mounted on a surface 11 to be mounted, a bent part 3 extending in a direction oblique to an orthogonal direction of the surface 10 to be cleaned from the mounting part 2, and a slide part 4 that is integrated with the mounting part 2 and the bent part 3 and can contact the surface 10 to be cleaned. The mounting part 2 has a frame 5 and a back part 6 oppositely contacted with the frame 5 and formed integrally with the bent part 3. In the frame 5 and the back part 6 are formed hole parts 7 through which bolts 12 are inserted. The back part 6 is formed of an elastic body with JIS-A hardness of 70° or more. The frame 5 is formed of a steel plate with Rockwell hardness (HRB) of 65 or more or Vickers hardness HV of 115 or more. A thickness of the frame 5 is 2.3 mm or more and a ratio of the thickness of the back part 6 to the thickness of the mounting part 2 is less than 33%.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wiper for removing metal dust and the like on a surface (cleaning surface) of a sliding member of an object.

  2. Description of the Related Art Conventionally, wipers for wiping foreign substances adhered to the surfaces (cleaned surfaces) of sliding members in order to prevent foreign substances such as metal chips and dust from being caught between sliding members of an object such as a machine tool have been known. Have been. This type of wiper usually has a frame made of a metal plate for reinforcement embedded in a mounting portion on the base end side (the side opposite to the surface to be cleaned) and is integrated with the machine tool via this frame. It is attached. During operation of the wiper, the wiper is configured so that the sliding portion on the distal end side can slide along the surface (cleaning surface) of the sliding member of the object while the entire portion other than the mounting portion bends. The parts other than the frame are integrally formed of an elastic body such as rubber or synthetic resin.

  The wiper disclosed in Patent Literature 1 has an appropriate bending property necessary for sliding the sliding portion along the surface to be cleaned, and has a coefficient of friction even when the wear of the sliding portion surface progresses. In order to maintain the lowered state, a friction reducing material including a fiber material is dispersed and compounded throughout the sliding portion while being oriented in a predetermined direction in the sliding portion. On the other hand, in this wiper, the body (particularly, the bent portion) which does not contain the friction reducing material and does not contact the surface to be cleaned is bent appropriately when the sliding portion slides, and the sliding portion is moved to the surface to be cleaned. Along with the surface to be cleaned and with an appropriate surface pressure (that is, while maintaining a close contact with the surface to be cleaned without forming a gap between the surface and the surface to be cleaned). As a result, foreign substances adhering to the surface to be cleaned can be reliably wiped off (see FIG. 1 of Patent Document 1).

  The attachment portion of this type of wiper is composed of a frame made of a reinforcing metal plate, and a back portion (an elastic portion of the attachment portion) which is opposed to the rear surface of the frame and is integrally formed with the bent portion. In addition, a plurality of holes (not shown in Patent Document 1) are formed in the attachment portion at substantially equal width directions, and bolts (not shown in Patent Document 1) are formed in the holes at the front side of the frame (not shown). The wiper (mounting portion) is inserted from the exposed surface side (the left side in FIG. 1 of Patent Document 1) so that the wiper (mounting portion) can be stably fixed to the mounting surface of an object such as a machine tool.

Japanese Patent No. 5531270

  However, the tightening torque of the bolt when this type of wiper (mounting portion) is attached to the machine tool does not loosen even when the wiper repeatedly receives a reaction force, vibration, or the like from the surface to be cleaned during operation of the wiper. Since it is essential (highest priority) that the wiper is fixed to the mounting surface of the machine tool immovably, in practice, the reference torque (sufficient and sufficient) for fixing the wiper (mounting portion) to the machine tool is required. For example, the bolt tends to be tightened with a torque larger than 2 Nm (for example, 5 to 6 Nm which is several times the reference torque).

  At this time, if the bolt is tightened with a torque larger than the reference torque, in the wiper shown in FIG. 1 of Patent Document 1 (hereinafter, also referred to as “conventional wiper”), the sliding portion of the wiper is placed on the surface to be cleaned. Even when a predetermined amount (for example, about 3 mm) is pressed, a gap is formed between the sliding portion (in short, the contact portion located at the tip of the surface to be cleaned) and the surface to be cleaned. As a result, the adhesion between the sliding portion and the surface to be cleaned is not ensured, and foreign matter adhered to the surface to be cleaned with an appropriate surface pressure against the surface to be cleaned when the sliding portion moves along the surface to be cleaned. Could not be reliably wiped off. In addition, there was no known defect phenomenon such as that in Patent Document 1 or the like that "when the bolt is tightened with excessive torque, it is impossible to ensure the adhesion between the sliding portion and the surface to be cleaned".

  The inventor of the present application has observed the above-mentioned inconvenience phenomenon in detail, and as a result, in particular, as the thickness (T1) of the frame is smaller, the ratio (T2) of the thickness (T2) of the back portion and the thickness (T) of the attachment portion is smaller. / T is larger (in other words, the smaller the ratio of the thickness (T1) of the frame to the thickness (T) of the mounting portion (the percentage of T1 / T) is), the larger the torque is than the reference torque. When the bolts are tightened, a gap is formed between the sliding portion and the surface to be cleaned, and it has been found that it is not possible to secure the adhesion between the sliding portion and the surface to be cleaned.

  An object of the present invention is to secure the adhesion between a sliding portion and a surface to be cleaned even when the tightening torque of the bolt is excessive when the mounting portion of the wiper is mounted on the surface to be mounted of the object. To provide a wiper.

One aspect of the present invention is a wiper that wipes the surface to be cleaned by sliding against the surface to be cleaned of an object,
A mounting portion mounted on the mounting surface,
A bent portion extending from the mounting portion in a direction inclined with respect to a direction orthogonal to the surface to be cleaned;
A sliding portion integrated with the mounting portion and the bent portion and capable of contacting the surface to be cleaned,
The mounting portion has a frame made of a metal plate, and a back portion which is opposed to the frame and is integrally formed with the bent portion, and a hole through which a bolt is inserted is formed in each of the frame and the back portion. Has been
The back part is formed of an elastic body having a JIS-A hardness of 70 ° or more,
The frame is formed of a steel plate having a Rockwell hardness HRB of 65 or more or a Vickers hardness HV of 115 or more,
Further, the thickness of the frame is not less than 2.3 mm, and the ratio of the thickness of the back portion to the thickness of the mounting portion is less than 33%.

  According to the above configuration, when the mounting portion of the wiper is mounted on the mounting surface of the machine tool or the like via the bolt inserted through the hole formed in the frame and the hole formed in the back portion, the bolt is not used. Even if the tightening torque is excessive, it is possible to suppress the compression deformation of the back portion formed of the elastic body while suppressing the deformation of the frame. Accordingly, it is possible to suppress the occurrence of a gap between the sliding portion and the surface to be cleaned, which is caused by the compression deformation of the back portion, and to ensure the close contact between the sliding portion and the surface to be cleaned.

  Further, one of the present invention is characterized in that in the wiper, the bent portion is formed of an elastic body having a JIS-A hardness of 70 ° to 85 °.

  According to the above configuration, the bending portion connecting the mounting portion and the sliding portion is provided with a good balance of rigidity and flexibility, so that the sliding portion moves with respect to the surface to be cleaned when the sliding portion moves along the surface to be cleaned. As a result, it is possible to more reliably ensure the wiping performance of the wiper, such that the foreign matter adhered to the surface to be cleaned can be reliably wiped off with an appropriate surface pressure.

  One aspect of the present invention is characterized in that in the wiper, the back portion and the bent portion are formed of an elastic body having the same hardness.

  According to the above configuration, the back portion and the bent portion can be formed of an elastic body made of the same composition, so that the wiper can be manufactured more economically.

  Another feature of the present invention is that, in the wiper, the frame is formed of a steel plate having a Rockwell hardness HRB of 85 or more or a Vickers hardness HV of 170 or more.

  According to the above configuration, when a relatively hard metal plate having a Rockwell hardness HRB of 85 or more or a Vickers hardness HV of 170 or more (for example, a hardened tempered cold-rolled steel plate) is used for the frame, Since the bending rigidity of the frame can be increased as compared with the case where a relatively non-hard Rockwell hardness HRB is 65 or more and less than 85 or a Vickers hardness HV is 115 or more and less than 170, a bolt is used. Even if the tightening torque is excessive, the deformation of the frame can be further suppressed, and the safety factor for ensuring the close contact between the sliding portion and the surface to be cleaned can be further increased.

  Provided is a wiper that can ensure the close contact between a sliding portion and a surface to be cleaned even when a tightening torque of a bolt is excessive when the mounting portion of the wiper is mounted on the surface to be mounted of an object. can do.

(A) It is a front view of the wiper single substance concerning this embodiment. (B) It is a front view of the state where the wiper concerning this embodiment was pressed on the surface to be cleaned. It is a side view of the wiper concerning this embodiment. It is a front perspective view of the state where the wiper concerning this embodiment was pressed on the surface to be cleaned (not shown). (A) It is a front view of the wiper simple substance concerning comparative example 1 (conventional wiper). (B) It is a front view of the state where the wiper concerning comparative example 1 was pressed on the surface to be cleaned. FIG. 7 is a side view of the wiper according to Comparative Example 1. FIG. 6 is a front perspective view of a state in which the wiper according to Comparative Example 1 is pressed against a surface to be cleaned (not shown). FIG. 9 is a diagram illustrating deformation of a mounting portion of a wiper according to Comparative Example 1 before and after bolt tightening. FIG. 7 is an AA diagram and a BB diagram of the wiper according to Comparative Example 1. FIG. 9 is a diagram illustrating an AA diagram of a wiper according to a comparative example 2. It is an AA diagram and a BB diagram of a wiper concerning Example 1 (Examples 4-6, comparative example 3). FIG. 9 is an AA diagram of a wiper according to a second embodiment and an AA diagram according to a third embodiment. It is explanatory drawing of the sliding resistance measurement test which concerns on an Example. It is explanatory drawing of the breaking load measurement test which concerns on an Example.

(Embodiment)
Next, an embodiment of the present invention will be described. The present embodiment is an example in which the present invention is applied to a wiper 1 for a machine tool that removes foreign matter such as metal scrap generated during machining in a machine tool.

  As shown in FIG. 1 (B), the wiper 1 is configured such that a sliding part 4 at a tip end thereof slides on a surface (cleaning surface 10) of a metal part constituting a machine tool (not shown). This is for wiping foreign substances adhered to the surface 10 to be cleaned.

  As shown in FIGS. 1 to 3, the wiper 1 has a mounting portion 2 mounted on a mounting surface 11 of a machine tool, and a bend extending from the mounting portion 2 in a direction inclined with respect to a direction orthogonal to the cleaning surface 10. A part 3 and a sliding part 4 integrated with the mounting part 2 and the bent part 3 and capable of contacting the surface 10 to be cleaned are provided. Then, as shown in FIG. 1 (B), the wiper 1 has the sliding surface 4 pressed against the surface 10 to be cleaned and the sliding portion 4 in contact with the surface 10 to be cleaned. By moving along, the foreign matter adhering to the surface to be cleaned 10 is wiped off.

  The mounting portion 2 has a back portion 6 integrally formed with the bent portion 3 and a frame 5 made of a metal plate, and is joined so that the frame 5 comes into contact with the back portion 6 as shown in FIG. . The frame 5 and the back part 6 are each formed with a hole 7 through which the bolt 12 is inserted.

  The frame 5 is formed of, for example, a strip-shaped metal plate such as a cold-rolled steel plate, and is embedded in the back portion 6 and integrated (specifically, bonded with an adhesive) to form a core material for reinforcing the back portion 6. Play a role. The frame 5 is made of a steel plate having a Rockwell hardness HRB of 65 or more or a Vickers hardness HV of 115 or more.

The frame 5 is preferably made of a steel plate having a Rockwell hardness HRB of 85 or more or a Vickers hardness HV of 170 or more. For example, it is preferably formed of a hard cold-rolled steel plate (SPCC) tempered to hard (temper symbol: 1) specified in JIS G 3141: 2005.
As described above, when a relatively hard metal plate having a Rockwell hardness HRB of 85 or more or a Vickers hardness HV of 170 or more is used for the frame 5, the Rockwell hardness HRB which is not relatively hard is used for the frame 5. Is higher than 65 or less than 85 or a steel plate having Vickers hardness HV of 115 or more and less than 170, since the bending rigidity of the frame 5 can be increased, even if the tightening torque of the bolt 12 is excessive. Thus, the deformation of the frame 5 can be further suppressed, and the safety factor for ensuring the close contact between the sliding portion 4 and the surface 10 to be cleaned can be further increased.

  As shown in FIG. 2, the thickness (T1) of the frame 5 is 2.3 mm or more, and the ratio of the thickness (T2) of the back part 6 to the thickness (T) of the mounting part 2 composed of the frame 5 and the back part 6 is It is configured to be less than 33% (T2 / T <0.33). In the present embodiment, as shown in FIG. 2, the thickness (T) of the mounting portion 2 is set to 3.4 mm, the thickness (T1) of the frame 5 is set to 2.3 mm, and the thickness (T2) of the back portion 6 is set to 1.1 mm. Thus, the ratio of the thickness (T2) of the back portion 6 to the thickness (T) of the mounting portion 2 is set to be less than 33%.

  As shown in FIG. 1A, the holes 7 are provided at a plurality of locations on the approximate center line in the height direction (vertical direction) of the frame 5 at substantially equal intervals (for example, pitch 150 mm) in the width direction. Then, the plurality of bolts 12 are screwed into the plurality of screw holes 13 provided on the mounting surface 11 of the machine tool through the respective holes 7 of the mounting portion 2. Thereby, the wiper 1 is mounted on the mounting surface 11 of the machine tool.

  As shown in FIG. 2, when the wiper 1 is pressed against the surface 10 to be cleaned, the bending portion 3 deforms the bending portion 3 so that the sliding portion 4 comes into close contact with the surface 10 to be cleaned. A notch 8 is formed.

  Further, the back portion 6 and the bent portion 3 are made of rubber such as chloroprene rubber (CR), nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), styrene butadiene rubber (SBR), and ethylene / propylene diene monomer (EPDM). It is made of a material or an elastic material such as a synthetic resin material such as polyurethane.

  When the back portion 6 and the bent portion 3 are made of a rubber material, a compounding agent such as carbon black for reinforcement, an antioxidant, a plasticizer, and a vulcanizing agent is usually compounded. However, the hardness of the back portion 6 (JIS-A hardness) is preferably 70 ° or more, and the hardness of the bent portion 3 (JIS-A hardness) is preferably 70 ° to 85 °. In addition, since the back portion 6 and the bent portion 3 are integrally formed, it is preferable that the back portion 6 and the bent portion 3 be formed of the same elastic material. Therefore, in order to set the hardness of the bent portion 3 and the back portion 6 to a value within the hardness range of 70 ° to 85 °, 40 to 75 parts by mass of carbon black and 100 parts by mass of the antioxidant are added to 100 parts by mass of rubber. 5 to 3.5 parts by mass, 1 to 10 parts by mass of zinc oxide, 5 to 20 parts by mass of a plasticizer, and 1 to 3.5 parts by mass of a vulcanizing agent.

  By setting the hardness (JIS-A hardness) of the bending portion 3 to 70 ° to 85 ° as described above, the bending portion 3 connecting the mounting portion 2 and the sliding portion 4 has a good balance of rigidity and flexibility. With the provision, when the sliding portion 4 moves along the surface to be cleaned 10, the foreign matter adhered to the surface to be cleaned 10 can be reliably wiped with an appropriate surface pressure against the surface to be cleaned 10. When the back portion 6 and the bent portion 3 are formed of an elastic body made of the same composition, the wiper 1 can be manufactured more economically.

  The sliding portion 4 extends further from the distal end of the bent portion 3 along the extending direction. The sliding portion 4 is integrated with the bent portion 3 by welding, integral press vulcanization, or the like. The sliding portion 4 is made of a rubber material such as chloroprene rubber (CR), nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), styrene butadiene rubber (SBR), ethylene propylene diene monomer (EPDM), or the like. And an elastic material such as a synthetic resin material such as polyurethane. Further, the elastic material forming the sliding portion 4 has a friction for reducing frictional resistance between the sliding portion 4 and the surface 10 to be cleaned, which is generated when the sliding portion 4 slides against the surface 10 to be cleaned. Reduction material is blended. As the friction reducing material, it is possible to use only fiber materials such as polyamide fibers, aramid fibers, polyester fibers, and cotton fibers, or a combination of these fiber materials with graphite, fluororesin, ultrahigh molecular weight polyethylene, or the like.

  Further, when the sliding portion 4 is made of a rubber material, a compounding agent such as carbon black for reinforcement, an antioxidant, a plasticizer, and a vulcanizing agent is usually compounded. In order to realize the low sliding resistance required for the sliding portion 4, 20 to 55 parts by mass of carbon black with respect to 100 parts by mass of rubber, and a friction reducing material such as short fiber, graphite, and ultra-high molecular weight polyethylene. 10 to 40 parts by mass, an antioxidant 1.5 to 3.5 parts by mass, zinc oxide 1 to 10 parts by mass, a plasticizer 5 to 20 parts by mass, and a vulcanizing agent 1 to 3.5 parts by mass. It is blended at such a ratio.

  As described above, by blending the friction reducing material with the elastic material forming the sliding portion 4, the surface friction coefficient of the sliding portion 4 is reduced, and the frictional resistance between the sliding portion 4 and the surface 10 to be cleaned during sliding is reduced. Is reduced. Further, since the friction reducing material is dispersed throughout the sliding portion 4, even if the wear of the sliding portion 4 progresses as the wiper 1 is used, the friction coefficient does not increase, and the friction reducing effect is maintained for a long time. Is maintained. The surface of the sliding portion 4 should be polished to remove the surface layer of the rubber formed at the time of molding and to increase the exposed area of the friction reducing material so that the friction coefficient is further reduced and the frictional resistance is further reduced. Is preferred. The polishing of the sliding portion 4 can be performed using, for example, a cylindrical polishing device. That is, by rotating the grindstone at a predetermined peripheral speed (for example, about 10 to 30 m / sec) with the sliding part 4 lightly contacting the cylindrical grindstone of the polishing apparatus, the surface of the sliding part 4 is Is polished to expose the friction reducing material.

  Furthermore, in order for the sliding portion 4 to reliably scrape foreign substances adhered to the surface 10 to be cleaned, the sliding portion 4 needs to have a certain degree of hardness (for example, about 70 ° to 85 ° in JIS-A hardness). There is. Here, as described above, when a friction reducing material such as a fiber material or graphite is blended with the elastic material forming the sliding portion 4, the ratio of the elastic material contained in the sliding portion 4 is relatively reduced. As a result, the hardness of the sliding portion 4 increases. Therefore, blending a friction reducing material in the sliding portion 4 is also advantageous from the viewpoint of improving wiping performance.

  When a fiber material is used as the friction reducing material, the fiber material is blended in the sliding portion 4 made of rubber or the like. Preferably, it is oriented in a direction crossing 10 (a vertical direction orthogonal to the width direction (left-right direction) of the wiper 1 in FIG. 3). When the fiber material serving as the friction reducing material has no orientation, or is oriented parallel to the surface 10 to be cleaned (when oriented in the width direction (lateral direction) of the wiper 1 in FIG. 3). The sliding portion 4 after molding is likely to have a wavy shape, and the external shape may be deteriorated. Further, a gap may be formed between the sliding portion 4 and the surface 10 to be cleaned, and the adhesion may be deteriorated. On the other hand, when the fiber material is oriented in the vertical direction, the sliding portion 4 is less likely to be wavy after molding, and the problem such as deterioration of the external shape is less likely to occur. Further, the adhesion of the sliding portion 4 to the surface to be cleaned 10 is increased, and the wiping performance is improved.

  On the other hand, since the back portion 6 and the bent portion 3 do not contact the surface 10 to be cleaned, unlike the sliding portion 4, it is not necessary to mix a friction reducing material to lower the friction coefficient in the first place. Absent. Conversely, if the hardness of the bent portion 3 becomes too high due to the addition of the friction reducing material, the flexibility of the bent portion 3 is lost. For this reason, the sliding portion 4 does not easily slide along the surface 10 to be cleaned, and it is not possible to reliably wipe off foreign substances on the surface 10 to be cleaned.

  Therefore, in the present embodiment, the back portion 6 and the bent portion 3 do not contain a friction material such as a fiber material or graphite. This makes it possible to provide the bent portion 3 with appropriate rigidity and flexibility, and it is possible to reliably wipe off foreign substances attached to the surface 10 to be cleaned. In order to improve the scraping performance of the sliding portion 4 by providing the bending portion 3 with a good balance of rigidity and flexibility, as described above, the hardness of the bending portion 3 is 70 ° to JIS-A hardness. Preferably it is 85 °.

  Further, in the conventionally known configuration in which the friction reducing material is blended into the entire wiper, the friction reducing material also exists at the bonding portion with the metal frame. Due to the decrease in the blending amount of the members, the adhesive strength between the wiper and the frame decreases. Further, when oil components such as cutting oil used during machining of the machine tool penetrate into the elastic member, the adhesive strength between the wiper and the frame is further reduced. However, in this embodiment, since the back part 6 bonded to the metal frame 5 is not compounded with the friction reducing material, the above-described problem of a decrease in the adhesive strength does not occur.

  As described above, by separating the material (combination / non-combination of the friction reducing material) between the back portion 6 and the bent portion 3 and the sliding portion 4 which originally require different functions, the back portion 6 and the bent portion 3 can be slid. For each of the parts 4, it is possible to determine the most suitable material to satisfy the required function. That is, in determining the material of the back portion 6 and the bent portion 3, it is not necessary to consider a reduction in the surface friction coefficient required only for the sliding portion 4, and in determining the material of the sliding portion 4, It is not necessary to consider an appropriate hardness range required only for the bent portion 3 and securing of adhesiveness to the frame 5.

  As described above, when cleaning the surface 10 to be cleaned, the sliding portion 4 of the wiper 1 is pressed against the surface 10 to be cleaned by a predetermined amount (for example, 0 according to the length L1 of the sliding portion 4). 0.5 to 3.0 mm). Thus, even after the sliding portion 4 is pressed against the surface 10 to be cleaned, only the sliding portion 4 containing the friction reducing material contacts the surface 10 to be cleaned, and the friction reducing material is It is necessary to prevent the bent portion 3 that is not blended from coming into contact, and it is necessary that the sliding portion 4 has a certain length. On the other hand, if the length of the sliding portion 4 containing the friction reducing material is too long, the flexibility of the wiper 1 as a whole is reduced. Therefore, the length L1 of the sliding portion 4 is in the range of L0 / 3 to L0 / 2 with respect to the total length L0 (length of the bent portion 3 and the sliding portion 4) of the portion extending obliquely from the mounting portion 2. Is preferred.

(Comparison with conventional wiper)
FIGS. 4 to 8 show the configuration of a conventional wiper 1 ′ (corresponding to Comparative Example 1) in order to compare the wiper 1 of the present invention with the conventional wiper 1 ′.

  In the conventional wiper 1 ', when the mounting portion 2' of the wiper 1 'is mounted on the mounting surface 11 of an object such as a machine tool, if the bolt 12 is tightened with a torque larger than a reference torque, FIG. As shown in FIG. 5, even when the sliding portion 4 'of the wiper 1' is pressed against the surface 10 to be cleaned by a predetermined amount (for example, about 3 mm), the sliding portion 4 ' The cause of the gap C2 between them may be due to the following effects (1) to (5).

  (1) The larger the ratio (value of T2 / T) of the thickness (T2) of the back part 6 'to the thickness (T) of the mounting part 2' composed of the frame 5 'and the back part 6' (for example, about 50%) ), Even if the tightening torque of the bolt 12 is the same, the elastic body of the back part 6 'is excessively compressed and deformed. The ratio (value of T2 / T) of the thickness (T2) of the back portion 6 'to the thickness (T) of the mounting portion 2' is a state (bolt 12) before being mounted on the mounting surface 11 unless otherwise specified. Before tightening).

  (2) In the above case, the compression load naturally concentrates on the rear part of the head of the bolt 12 (the annular part sandwiched between the head and the mounting surface 11) in the mounting part 2 ', and the width of the wiper 1' The compressive load does not concentrate on the portion where the bolt 12 is not present in the direction (during the bolt pitch BP).

  (3) Therefore, as the thickness (T1) of the frame 5 'is smaller and the ratio of the thickness (T2) of the back part 6' to the thickness (T) of the mounting part 2 '(the value of T2 / T) is larger. As shown in FIG. 6 and FIG. 7, the mounting portion 2 ′ has a portion without the bolt 12 (a portion between the bolt pitches BP) in the width direction of the wiper 1 ′ ahead of the rear portion of the head of the bolt 12. The gap C1 (front-rear direction) between the back portion 6 'and the mounting surface 11 is likely to be generated.

  (4) As described above, with the wavy deformation that curves forward between the bolt pitches BP in the mounting portion 2 ′, each bolt is also formed in the bent portion 3 ′ and the sliding portion 4 ′ formed integrally with the back portion 6 ′. It curves forward between the pitches BP.

  (5) The bent portion 3 'and the sliding portion 4' in front of the head of the bolt 12 keep balance with the distortion when the bent portion 3 'and the sliding portion 4' are bent forward during the bolt pitch BP. Under such a deformation action, instead of being restrained by the bolt 12 and being unable to bend forward, it is lifted up and deformed, and as shown in FIG. 6, a gap C2 is formed between the sliding portion 4 'and the surface 10 to be cleaned. (Vertical direction) occurs.

  On the other hand, in the wiper 1 of the present embodiment, the back part 6 of the attachment part 2 is formed of an elastic body having a JIS-A hardness of 70 ° or more, and the frame 5 has a Rockwell hardness HRB of 65 or more or Vickers hardness. And the thickness (T1) of the frame 5 is 2.3 mm or more, and the thickness (T2) of the back portion 6 with respect to the thickness (T) of the mounting portion 2 composed of the frame 5 and the back portion 6 is HV. ) Is less than 33% (T2 / T <0.33). Therefore, when the mounting portion 2 of the wiper 1 is mounted on the mounting surface 11 of an object such as a machine tool. Even if the bolt 12 is tightened with a torque (for example, 5 to 6 Nm) that is larger than a reference torque (for example, 2 Nm) that can fix the mounting portion 2 of the wiper 1 to the mounting surface 11 as necessary and sufficient, Not so rigid general purpose A metal plate (e.g., semi-rigid cold-rolled steel plate) as was used in the frame 5, while certain degree of flexural rigidity of the frame 5, can be made relatively small amount of compressive deformation of the back 6.

  For this reason, a deformation (waving deformation) that curves forward in a direction in which a gap C1 (front-back direction) occurs between the back portion 6 and the mounting surface 11 between the bolt pitches BP, and a front portion of the head of the bolt 12 Of the bent portion 3 and the sliding portion 4 in the direction in which a gap C2 (vertical direction) is formed between the sliding portion 4 and the surface 10 to be cleaned can be significantly suppressed (FIG. 3). reference).

  Therefore, according to the wiper 1 of the present embodiment, even when the sliding portion 4 of the wiper 1 is pressed against the surface 10 to be cleaned by a predetermined amount (for example, about 3 mm), compared with the conventional wiper 1 '. In addition, the generation of the gap C2 between the sliding portion 4 and the surface 10 to be cleaned can be suppressed, and the adhesion to the surface 10 to be cleaned can be ensured.

  As above, an example of the embodiment of the present invention has been described, but the form to which the present invention can be applied is not limited to this.

  The bent portion 3 may be formed of an elastic body having a JIS-A hardness exceeding 85 °. Further, the back portion 6 and the bent portion 3 may be formed of elastic bodies having different hardnesses. Further, the back portion 6, the bent portion 3, and the sliding portion 4 may be integrated with elastic members having different hardnesses.

  Further, the wiper 1 itself may be fixed so as not to move, and the metal component having the surface 10 to be cleaned may be configured to move with respect to the wiper 1.

  The application of the present invention is not limited to a wiper for removing metal dust and the like for a machine tool, but slides on a surface to be cleaned to which foreign matter such as dust adheres to remove the foreign matter. The present invention is also applicable to wipers used in other fields.

  A bolt tightening test was performed on the specimen of the wiper according to Examples 1 to 6 and the specimen of the wiper according to Comparative Examples 1 to 3, and the hardness of the back part and the bent part, and the thickness ratio of the mounting part were determined. The effect of (percentage of T2 / T) on securing the adhesion of the sliding portion to the surface to be cleaned 10 was verified. For some of the specimens, an evaluation related to securing the wiper scraping performance (sliding resistance measurement test) and an evaluation related to securing the breaking strength of the wiper (rupture load measurement test) were also performed.

(Specimens of Wivers of Examples 1 to 6 and Comparative Examples 1 to 3)
The hardness of the back and bent portions (JIS-A), the hardness of the frame (Rockwell hardness HRB), the thickness of the frame (T1), and the thickness ratio of the mounting portion (T2 / Table 1 shows the percentage of T).

Here, the hardness of the back is a value measured by a type A durometer (rubber hardness meter) based on JIS K6253: 2012.
* As shown in Table 2, the hardness of the elastic part (the back part, the bent part, and the sliding part) other than the changed frame is determined by comparing the polymer (NBR) for carbon black among the compounding ingredients of the rubber composition. It was obtained by adjusting the input amount (phr) when the input amount was 100.
In the rubber compound of the back part and the bent part shown in Table 2, the compound (1) is Comparative Example 3, the compound (2) is Examples 4 and 6, and the compound (3) is Examples 1-3 and Comparative Examples 1 and 2. Formulation (4) was applied to Example 5.

(Examples 1 to 6)
・ Basic dimensions (common for each specimen)
Wiper: thickness of mounting part (T) 3.4 mm x length (vertical direction) 30 mm x width 650 mm
・ Dimensions of mounting part Frame: Thickness (T1) variable (see Table 1) × height (vertical direction) 18mm × width 650mm
The thickness (T1) of the frame is 2.3 mm or more (Examples 1, 4 to 6: 2.3 mm, Example 2: 2.5 mm, Example 3: 3.2 mm)
Back thickness (T2): Variable (see Table 1)
The thickness ratio (percentage of T2 / T) of the mounting portion was 32.4% in Examples 1 and 4 to 6 (FIG. 10), 26.5% in Example 2 (FIG. 11), and Example 3 (FIG. 11). ) Was 5.9%.
The thickness ratio of the mounting portions in Examples 1 to 6 is smaller than the level of the conventional wiper (Comparative Example 1 (FIG. 8) described later: 52.9%).
-Back hardness JIS-A hardness 70 ° or more, variable (see Table 1).
In addition, the back part and the bent part were formed of an elastic body made of a composition having the same composition. Therefore, hardness is the same.
-Material and hardness of frame For Examples 1 to 5, a quasi-hard cold-rolled steel plate (SPCC) tempered to ４ hard (temper symbol: 4) specified in JIS G 3141: 2005. Using. The Rockwell hardness HRB of this steel sheet was at a level of 65, and the Vickers hardness HV was at a level of 115.
In Example 6, a hard (temper symbol: 1) hardened cold-rolled steel sheet (SPCC) specified in JIS G 3141: 2005 was used. The Rockwell hardness HRB of this steel sheet was at a level of 85, and the Vickers hardness HV was at a level of 170.
・ Hole (common for each specimen)
Holes for M6 bolts (holes penetrating in the front-rear direction with a diameter of 6.6 mm) at five equally spaced locations (pitch: 150 mm) in the width direction of the wiper (650 mm in width) substantially on the center line of the frame in the height direction (vertical direction). ) Was formed.

(Comparative Examples 1 to 3)
-The basic dimensions and holes (positions and configurations) are the same as in Examples 1 to 6.
-Dimensions of mounting portion The thickness (T1) of the frame is 1.6 mm for Comparative Example 1, 2.0 mm for Comparative Example 2, and 2.3 mm for Comparative Example 3, and the thickness ratio of the mounting portion (percentage of T2 / T). ) Is 52.9% for Comparative Example 1 (FIG. 8), 41.2% for Comparative Example 2 (FIG. 9), and 32.4% for Comparative Example 3 (FIG. 10).
-The hardness (JIS-A hardness) of the back portion and the bent portion is 80 ° for Comparative Examples 1 and 2, and 65 ° for Comparative Example 3.
-Material and hardness of frame Same as in Examples 1 to 5.

(Bolt tightening test)
Evaluation was performed using a real machine (object: machine tool) as a test machine.
Test method (setting conditions)
・ Pressing amount to the surface to be cleaned: 3 mm (common for each specimen)
-Bolt tightening torque: For each specimen, it was carried out in the range of 1 to 6 Nm at 1 Nm steps.

(Installation of wiper)
Screw holes (for M6 bolts, 5 places) on the surface to be mounted (object) provided so that the amount of pressing against the surface to be cleaned is the above set amount (3 mm), and the mounting portion (rear surface: back side) The holes (five locations) were opposed to each other, and M6 bolts were each lightly screwed in (at this time, the bolt tightening torque: less than 1 N · m) and temporarily fixed.
Here, the bolt is an M6 hexagon socket head bolt having a head diameter of 10 mm. Since the frame serves as a washer, no flanged bolt is used, and no washer is used.

  Using a torque wrench, apply a tightening torque to the bolt from 1 Nm to 6 Nm in steps of 1 Nm in steps of 1 Nm using a torque wrench for each test piece. ) Was attached to the mounting surface of the object.

(Evaluation for securing adhesion to the surface to be cleaned (bolt tightening test))
At each stage of the bolt tightening torque, the following items were measured and evaluated based on the following evaluation methods and evaluation criteria.
・ Gap C1 between back and mounting surface (front-back direction)
* The gaps C1 (four places) between the bolt pitches BP were measured with a thickness gauge (in units of 0.01 mm), and the maximum value among them was taken as the measured value of the gap C1.
・ Gap C2 between sliding part and surface to be cleaned (vertical direction)
* The gaps C2 (5 places) in front of the bolt head were measured with a thickness gauge (0.01 mm unit), and the maximum value among them was taken as the measured value of the gap C2.
-Adhesion to the surface to be cleaned When the measured value of the gap C2 was 0 (no gap), it was judged that the adhesion of the sliding portion to the surface to be cleaned could be ensured, and the evaluation was "O".
On the other hand, when the measured value of the gap C2 was 0.01 mm or more, it was determined that the adhesion of the sliding portion to the surface to be cleaned could not be ensured, and the evaluation was "x".

(Evaluation for ensuring the wiper's scraping performance (sliding resistance measurement test))
As described above, according to Patent Document 1 [0034 to 0037], the bending portion connecting the mounting portion and the sliding portion is provided with a good balance of rigidity and flexibility to improve the scraping performance of the sliding portion. (In other words, when the sliding portion moves along the surface to be cleaned, it is necessary to ensure that the foreign matter adhered to the surface to be cleaned can be wiped off with an appropriate surface pressure against the surface to be cleaned. It is known that the hardness of the bent portion is preferably 70 ° to 85 ° in JIS-A hardness. This is because, when the hardness of the bent portion (JIS-A hardness) is less than 70 °, the sliding resistance is less than 20 g / cm, and the surface pressure at which the sliding portion presses the surface to be cleaned is reduced. On the other hand, when the hardness of the bent portion exceeds 85 °, the sliding resistance becomes considerably large (66 g / cm from the graph of FIG. (Exceeding the sliding resistance), the sliding portion cannot slide smoothly (Patent Document 1 [0037]). "

  Therefore, a specimen (wiper) having a configuration including a lower limit and an upper limit of a preferred range of the hardness of the bent portion (70 ° to 85 ° in JIS-A hardness) (Examples 4 and 5), and the bent portion Of a specimen (wiper) (Comparative Example 3) adjusted so that the hardness (JIS-A hardness) is less than 70 °, the sliding resistance was measured, and the evaluation related to securing the scraping performance of the wiper was performed. Was carried out.

(Specimen (wiper))
-Specimen (wiper) whose bending part has a JIS-A hardness of 70 ° (Example 4)
-Specimen (wiper) with a bending part having a JIS-A hardness of 85 ° (Example 5)
-Specimen (wiper) whose bending part has a JIS-A hardness of 65 ° (Comparative Example 3)

(Evaluation item)
As an evaluation item, a sliding resistance (g / cm) was measured.

(Evaluation method)
For each of the wipers of Examples 4 and 5 and Comparative Example 3 having different bending portions in hardness, the sliding resistance (friction resistance) when the sliding portion was slid against the surface to be cleaned was measured. Specifically, as shown in FIG. 12, the wiper guided in the vertical direction by the guide 31 is pressed down on the stainless steel plate 30 by 3 mm, and the stainless steel plate 30 is brought into contact with the sliding part. Moved horizontally. At this time, the horizontal force acting on the wiper was measured by the load cell 32, and this was defined as the sliding resistance. According to this method, there is no mounting surface, and there is no bolt tightening of the mounting portion to the mounting surface. Therefore, the adhesion between the sliding portion and the surface to be cleaned is ensured irrespective of the configuration of the attachment portion (for example, even with the wiper of Comparative Example 3).

(Evaluation criteria)
For the above reason, if the sliding resistance was 20 g / cm or more and 66 g / cm or less, it was judged that the wiper scraping performance could be secured, and the evaluation was "O".
On the other hand, when the sliding resistance was less than 20 g / cm or more than 66 g / cm, it was judged that the wiper scraping performance could not be ensured, and the evaluation was "x".

(Evaluation for securing the breaking strength of the wiper (breaking load measurement test))
When the back has a small thickness (FIG. 11, Example 3), when the wiper ages due to heat and oil immersion, the sliding portion of the wiper is pressed against the surface to be cleaned by a predetermined amount (for example, about 3 mm). In this state, the wiper may be broken by a tearing force acting on a boundary portion (particularly on the rear surface side) between the back portion and the bent portion.

  Therefore, the test piece (wiper) having the thinnest back portion (Example 3) and the test piece having the thickest back portion (ie, the conventional wiper: Comparative Example 1) are new and old. With respect to the product, the breaking load was measured by a tensile tester (autograph), and an evaluation related to securing the breaking strength of the wiper was performed.

(Specimen (wiper))
-New and aged specimens (wiper) having the thinnest back (Example 3)-New and aged specimens (conventional wiper) having the thickest back (Comparative Example 1) Aging

The specimen (wiper) was immersed in immersion oil diluted under the following conditions for 30 days.
Immersion oil: Cutting oil (for machine tools)
Dilution ratio: 20 (water): 1 (cutting oil)
Immersion temperature: 70 ° C (in a thermostat)
Immersion days: 30 days

(Evaluation item)
As an evaluation item, a breaking load (a target portion: a boundary portion between a back portion and a bent portion) was measured.

(Evaluation method)
Using a tensile tester (autograph) as shown in FIG. 13, a breaking test was performed on the test specimens (new and aged products) under the following conditions, and the breaking load was read. In addition, the test result was arranged by the index | index when the breaking load (N / cm) per 1 cm of width is 100 in the new article of the conventional wiper (Comparative Example 1).

(Break test conditions)
Tensile load: 10 mm / min Atmospheric temperature, humidity: 25 ° C ± 2 ° C, 50% ± 10%

(Evaluation criteria)
When the breaking load (index) was 80 or more, it was judged that the breaking strength at the boundary between the back portion and the bent portion of the wiper was sufficiently ensured, and the evaluation was "O".
On the other hand, when the breaking load (index) is less than 80, it was judged that the breaking strength at the boundary between the back portion and the bent portion of the wiper was not sufficiently secured, and the evaluation was "x".

(Effects confirmed by the above test results)
Table 1 shows the results of the bolt tightening test, the sliding resistance measurement test, and the breaking load measurement test. And the following effects were able to be confirmed from each test result.

(Effects confirmed from the evaluation of ensuring adhesion to the surface to be cleaned (bolt tightening test))
The attachment portion of the wiper in each of Examples 1 to 5 has a back portion formed of an elastic body having a JIS-A hardness of 70 ° or more, and the frame has a Rockwell hardness HRB of 65 or more or a Vickers hardness HV of 115. The thickness (T1) of the frame is 2.3 mm or more, and the ratio of the thickness (T2) of the back portion to the thickness (T) of the mounting portion is the same as that of the conventional (Comparative Example 1) (for example, (Approximately 50%), which is smaller than 33%, so that when the wiper (mounting part) is mounted on the surface to be mounted on the object such as a machine tool, the wiper (mounting part) is attached to the surface to be mounted. Even if the bolt is tightened with a torque (for example, 5 to 6 Nm) that is excessively large than a reference torque (for example, 2 Nm) that can be fixed sufficiently, the comparison with Comparative Examples 1 to 3 that does not have the above configuration is made. Not so hard Metal plate (for example, a quasi-hard cold-rolled steel plate with a Rockwell hardness HRB of about 65) is used as a frame material, and the flexural rigidity of the frame is secured to some extent, and the compression deformation of the back (elastic body) is compared. It was found that it can be kept extremely small (especially, a comparison between Comparative Example 1 and Example 4: see Table 1 remarks “Amount of compression of back”).

  For this reason, a deformation (waving deformation) that curves forward in a direction in which a gap C1 (front-rear direction) between the back (rear surface) and the mounting surface between the bolt pitches BP occurs, and bending of the bolt forward of the head. It has been found that the deformation in which the part and the sliding part are lifted upward in the direction in which the gap C2 (vertical direction) between the sliding part and the surface to be cleaned is generated (especially in Comparative Examples 1, 2, By comparison between Examples 1-4).

  Further, as in Embodiment 6, if the frame is formed of a steel plate having a Rockwell hardness HRB of 85 or more or a Vickers hardness HV of 170 or more, a relatively hard metal plate (for example, hardened The cold-rolled steel sheet), the frame is not so hard, and the Rockwell hardness HRB is 65 or more and less than 85 or the Vickers hardness HV is 115 or more and less than 170 (for example, Example 4). In comparison, since the bending rigidity of the frame can be increased, it has been found that the safety factor for securing the adhesion to the surface to be cleaned when the tightening torque of the bolt is excessive can be further increased (the back portion). And the bending portion has a JIS-A hardness of 70 °, according to a comparison between Example 4 and Example 6).

(Effects confirmed from the evaluation related to securing the wiper scraping performance (sliding resistance measurement test))
If the bent portion is formed of an elastic body having a JIS-A hardness of 70 ° to 85 °, the adhesion to the surface to be cleaned and the sliding resistance can be properly maintained, and the sliding portion is formed on the surface to be cleaned. It is possible to ensure the wiper's scraping performance more reliably, such that foreign substances adhering to the surface to be cleaned can be reliably wiped with an appropriate surface pressure when moving along the surface. It was found that it was possible (by comparison between Comparative Example 3, Examples 4 and 5).

(Effects confirmed from the evaluation related to securing the breaking strength of the wiper (breaking load measurement test))
If the back portion and the frame made of a metal plate are firmly joined by an adhesive, even when the back portion has a small thickness (Example 3), the wiper may be aged when it is aged by heat and oil immersion. The breaking strength is sufficiently secured, as in Comparative Example 1. When the wiper ages due to heat and oil immersion, the sliding portion of the wiper is pressed against the surface to be cleaned by a predetermined amount (for example, about 3 mm). In this state, it was found that even if a tearing force was applied to the boundary between the back and the bent portion, there was no possibility that the wiper would break at this portion (based on a comparison between Comparative Example 1 and Example 3).

DESCRIPTION OF SYMBOLS 1 Wiper 2 Mounting part 3 Bending part 4 Sliding part 5 Frame 6 Back part 7 Hole 8 Notch 10 Cleaning surface 11 Mounting surface 12 Bolt 13 Screw hole

Claims (4)

A wiper that wipes the surface to be cleaned by sliding against the surface to be cleaned of an object,
A mounting portion mounted on the mounting surface,
A bent portion extending from the mounting portion in a direction inclined with respect to a direction orthogonal to the surface to be cleaned;
A sliding portion integrated with the mounting portion and the bent portion and capable of contacting the surface to be cleaned,
The mounting portion has a frame made of a metal plate, and a back portion which is opposed to the frame and is integrally formed with the bent portion, and a hole through which a bolt is inserted is formed in each of the frame and the back portion. Has been
The back part is formed of an elastic body having a JIS-A hardness of 70 ° or more,
The frame is formed of a steel plate having a Rockwell hardness HRB of 65 or more or a Vickers hardness HV of 115 or more,
Furthermore, the wiper is characterized in that the thickness of the frame is not less than 2.3 mm, and the ratio of the thickness of the back portion to the thickness of the mounting portion is less than 33%.   The wiper according to claim 1, wherein the bent portion is formed of an elastic body having a JIS-A hardness of 70 ° to 85 °.   The wiper according to claim 1, wherein the back portion and the bent portion are formed of an elastic body having the same hardness.   The wiper according to any one of claims 1 to 3, wherein the frame is formed of a steel plate having a Rockwell hardness HRB of 85 or more or a Vickers hardness HV of 170 or more.