JP6247461B2 - Measuring method of deformation of member - Google Patents

Description

  The present invention relates to a measurement method that can quickly and accurately measure the amount of deformation of a member having temporal deformation characteristics.

  For example, when making a rubber product, an unvulcanized rubber member is prepared. The rubber member is formed in a predetermined dimension by rolling, pressing, or extruding. The rubber member is vulcanized as it is or after being secondarily processed into a desired shape or the like. Thereby, the target rubber product is manufactured.

  By the way, the above-mentioned unvulcanized rubber member or the like has a time-deformation characteristic that its shape is gradually deformed over time. For example, a general unvulcanized rubber member tends to shrink over time. Therefore, since the dimension of the member having the time-deformation characteristics as described above is not stable, there is a problem that the finished dimension and performance of the final product using the same vary.

  In order to solve the above problems, an apparatus for manufacturing a member has been adjusted or improved so that the amount of deformation with time of the member is measured and the amount of deformation becomes small.

JP 2010-173223 A

  When measuring the amount of deformation of the member over time, the member is placed on a support base, and its dimension is measured after a certain period of time. However, friction occurs on the contact surface between the member and the support base when the member is deformed, and the original temporal deformation is likely to be hindered. For this reason, the conventional measuring method has a problem that the amount of deformation with time of the member cannot be measured quickly and accurately.

  The present invention has been devised in view of the actual situation as described above, and friction reducing means for reducing the coefficient of friction between the member and the support base is disposed between the member and the support base on which the member is placed. The main object of the present invention is to provide a measurement method that can quickly and accurately measure the amount of deformation of a member that deforms over time.

The method for measuring the amount of deformation of a member according to the present invention is a method for measuring the amount of deformation of a member having temporal deformation characteristics, wherein the member and the support table on which the member is placed, a step of temporal deformation by placing a friction reducing means for reducing the coefficient of friction between the support table, look including a step of measuring the amount of deformation of members with time variation, the friction reducing means, the member It is a surface processing layer provided on the surface of the support table to be placed and formed of silicone resin or fluororesin .
Further, the method for measuring the amount of deformation of a member according to the present invention is a method for measuring the amount of deformation of a member having a time-dependent deformation characteristic, wherein the member and the support table on which the member is placed, Including a step of disposing a friction reducing means for reducing a friction coefficient between a member and the support base and deforming with time, and a step of measuring a deformation amount of the member deformed with time, wherein the friction reducing means includes the member It is a roller or a sphere that rotates with the deformation.

  In the method for measuring a deformation amount of the member according to the present invention, the member preferably has adhesiveness.

  In the method for measuring a deformation amount of the member according to the present invention, the member is preferably an unvulcanized rubber member.

  In the method for measuring a deformation amount of the member according to the present invention, the member is preferably in a sheet form.

  In the method for measuring a deformation amount of a member according to the present invention, a friction reducing means for reducing a friction coefficient between the member and the support base is disposed between the member that is deformed with time and the support base on which the member is placed. It includes a process. Such a friction reducing means can suppress the deformation of the member from being hindered, so that the deformation amount of the member can be measured quickly and accurately.

It is a conceptual diagram of a rolling device. It is a perspective view which shows a rubber member and a support stand. It is a flowchart which shows an example of the process sequence of the measuring method of this embodiment. It is a fragmentary sectional view of the rubber member and support stand shown in FIG. It is a fragmentary sectional view of a rubber member, a support stand, and fluid. It is a fragmentary sectional view of a rubber member, a support stand, and a surface processing layer. It is a perspective view of the support stand provided with the roller. It is a fragmentary sectional view of FIG. It is a graph which shows the relationship between the deformation amount of a rubber member, and measurement time.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The method for measuring the amount of deformation of a member of the present invention (hereinafter sometimes simply referred to as “measurement method”) is a method for measuring the amount of deformation of a member having a temporal deformation characteristic. The time-dependent deformation characteristic means a property that the shape is gradually changed over time. In this embodiment, an unvulcanized rubber member prepared when making a rubber product is exemplified as the member having the temporal deformation characteristics. This unvulcanized rubber member has adhesiveness.

  FIG. 1 shows an apparatus (rolling apparatus) 2 for producing an unvulcanized rubber member 1G. The rolling device 2 according to this embodiment includes a calendar unit 3, a cooling unit 4, and a winder unit 5.

  The calendar unit 3 includes, for example, a pair of calendar rolls 3r and 3r arranged so as to face each other in the vertical direction. By passing the rubber member 1G through the gap between the pair of calender rolls 3r and 3r, the rubber member 1G can be rolled into a sheet shape.

  The cooling unit 4 is composed of a plurality of drums 4a and 4b arranged vertically. Such a cooling part 4 can cool the rubber member 1G effectively by moving the sheet-like rubber member 1G in a zigzag manner between the upper and lower drums 4a, 4b.

  The winder unit 5 is provided with a conveyer 5a that conveys the cooled sheet-like rubber member 1G, and winding means 5b that winds the rubber member 1G cut into a predetermined size into a roll shape.

  With such a rolling device 2, a sheet-like rubber member 1G can be formed. Further, the rubber member 1G is pulled out again from the winding means 5b, and is vulcanized after being processed as it is or into a desired shape or the like. Thereby, the target rubber product is manufactured.

  By the way, the unvulcanized rubber member 1G tends to shrink with time. For this reason, the rubber member 1G tends to shrink with the passage of time even after being wound into a roll by the winding means 5b. Such shrinkage makes the size of the rubber member 1G unstable and tends to cause variations in the finished size and performance of the rubber product. In order to solve such a problem, in the production of the rubber member 1G, it is important to measure the amount of deformation of the rubber member 1G with time and adjust or improve the rolling device 2 in advance so that the amount of deformation becomes small. It is.

  FIG. 2 shows a support base 7 used for measuring the amount of deformation with time of the rubber member 1G. The support base 7 includes a plate-like body 7A formed in a substantially rectangular shape in plan view. The plate-like body 7A is made of, for example, metal or wood. In addition, a smooth surface 7s on which the rubber member 1G is placed is formed on the plate-like body 7A.

FIG. 3 is a flowchart illustrating an example of a processing procedure of the measurement method of the present embodiment.
In the measurement method of this embodiment, first, a sheet-like rubber member 1G is manufactured using the rolling device 2 shown in FIG. 1 (step S1).

  Next, as shown in FIG. 2, the rubber member 1G is extracted (step S2). In step S2 of the present embodiment, at least a part of the rubber member 1G just before being wound by the winding means 5b (shown in FIG. 1) is extracted. The rubber member 1G is formed in, for example, a substantially rectangular sheet shape in plan view. For example, the length L1 in the longitudinal direction is set to about 100 to 1500 mm, the length L2 in the short direction is set to about 100 to 500 mm, and the thickness W1 is set to about 0.1 to 10 mm.

  Next, friction reducing means 8 for reducing the friction coefficient between the rubber member 1G and the support base 7 is disposed between the rubber member 1G and the support base 7, and the rubber member 1G is deformed with time (step). S3). In step S3, first, the friction reducing means 8 is disposed on the surface 7s of the support base 7. Next, the rubber member 1 </ b> G is placed on the support base 7 through the friction reducing means 8. Then, the rubber member 1G is left until it is not deformed. The determination as to whether or not the rubber member 1G is no longer deformed is made, for example, by measuring the length L1 in the longitudinal direction or the length L2 in the short direction of the rubber member 1G at regular intervals (for example, 5 to 20 minutes). Is judged.

  4 shows a partial cross-sectional view of the rubber member 1G and the support base 7 shown in FIG. The friction reducing means 8 of this embodiment is a powder 11. The powder 11 suppresses contact between the rubber member 1 </ b> G and the support base 7. Therefore, the powder 11 can prevent the deformation of the rubber member 1G from being hindered by friction between the rubber member 1G and the support 7 (adhesion of the rubber member 1G). Therefore, in the step S3, the rubber member 1G can be deformed at an early stage as compared with the conventional case where the friction reducing means 8 (powder 11) is not disposed.

  The powder 11 can be appropriately selected. For example, talc, silica, calcium carbonate, zinc stearate, polytetrafluoroethylene, or the like that is chemically stable and has high lubricity is desirable.

The mass Ms (g) of the powder 11 to be dispersed is preferably defined by the following formula (1).
Ms ≧ m × S / (πr ² ) (1)
here,
m: mass of one particle of powder (g)
S: Contact area between member and support base (mm ² )
r: Average particle radius of powder (mm)

In the above formula (1), πr ² is an area where one particle of the powder 11 occupies the contact surface 12 of the rubber member 1G in plan view. For this reason, the contact area S between the rubber member 1G and the support base 7 is divided by the area πr ² occupied by one particle of the powder 11 so that the powder 11 is spaced from the contact surface 12 of the rubber member 1G. It is possible to determine the number of particles necessary to arrange them completely.

Then, the mass Ms of the powder 11 can be obtained by multiplying the number of particles S / πr ² of the powder 11 by the mass m of one particle of the powder 11. Therefore, in step S3, the powder 11 having a mass Ms (g) or more is used, so that the powder 11 can be disposed on the contact surface 12 without any gap, and the friction between the rubber member 1G and the support base 7 can be achieved. The coefficient can be reliably reduced.

  In the present embodiment, the friction reducing means 8 is exemplified by the powder 11, but is not limited thereto. For example, the friction reducing means 8 may be a fluid. FIG. 5 shows a partial cross-sectional view of the rubber member 1G, the support base 7, and the fluid 13. Such a fluid 13 can also suppress a contact with the rubber member 1G and the support stand 7, and can reduce a friction coefficient.

  The fluid 13 can be selected as appropriate, but a liquid 13r having a contact angle with respect to the rubber member 1G and the support base 7 of 90 degrees or less is desirable. Such a liquid 13r can exhibit hydrophilicity between the rubber member 1G and the support base 7, and can effectively prevent contact between the rubber member 1G and the support base 7.

  If the contact angle of the liquid 13r exceeds 90 degrees, there is a possibility that hydrophilicity cannot be sufficiently exhibited between the rubber member 1G and the support base 7. For this reason, the contact angle is more preferably 60 degrees or less, and still more preferably 30 degrees or less.

  The liquid 13r can be appropriately selected as long as it can exhibit the contact angle. For example, water excellent in hydrophilicity while preventing deterioration of the rubber member 1G and the support base 7 or industrial lubricating oil containing a paraffinic compound is desirable.

  Further, the friction reducing means 8 may be a surface processed layer provided on the surface 7 s of the support base 7. FIG. 6 shows a partial cross-sectional view of the rubber member 1G, the support base 7, and the surface processing layer 14. As the surface processed layer 14, a material that causes the member 1 to slip when the member 1 is deformed is selected. Such a surface processed layer 14 can reduce the coefficient of friction between the rubber member 1G and the support base 7.

  Although it can select suitably as the surface treatment layer 14, it is desirable to form with a silicone resin or a fluororesin etc., for example. Further, the thickness W2 of the surface processed layer 14 is desirably about 1 to 10 mm.

  Further, the friction reducing means 8 may be a roller that rotates with the deformation of the member 1. 7 and 8 show a support base 7 provided with a roller 15 as the friction reducing means 8. A plurality of rollers 15 according to this embodiment are arranged in a hole 7 </ b> H provided in the support base 7. The roller 15 is formed in a columnar shape, and its central axis 15c extends in the short direction of the rubber member 1G. Such a roller 15 is rotatably supported with respect to the deformation of the rubber member 1G in the longitudinal direction.

  The length L3 of the roller 15 is set to be longer than the length L2 (shown in FIG. 2) in the short direction of the rubber member 1G. Further, a plurality of rollers 15 are arranged in a region T1 larger than the length L1 (shown in FIG. 2) of the rubber member 1G in the longitudinal direction. Further, the roller 15 protrudes upward (for example, 1 to 20 mm) from the surface 7 s of the support base 7.

  Such a roller 15 can support the rubber member 1G without generating friction between the rubber member 1G and the surface 7s of the support base 7. Furthermore, since the roller 15 can rotate with the deformation of the rubber member 1G in the longitudinal direction, the deformation of the rubber member 1G is not hindered. Therefore, the roller 15 can deform the rubber member 1G at an early stage as compared with the conventional case where the friction reducing means 8 is not disposed.

  In addition, when the diameter D1 of the roller 15 is large, the contact area between the rubber member 1G and the roller 15 may be large, and deformation of the rubber member 1G may be hindered. From such a viewpoint, the diameter D1 is preferably 50 mm or less, more preferably 20 mm or less.

  Furthermore, a surface processed layer (not shown) that causes the rubber member 1G to slip may be provided on the surface of the roller 15. Such a surface processed layer can reduce the coefficient of friction between the rubber member 1G and the roller 15, and can effectively deform the rubber member 1G.

  Further, the friction reducing means 8 may be a sphere (not shown) that can rotate in any direction instead of the roller 15. In this case, it is desirable that a plurality of spheres are arranged in both the longitudinal direction and the short direction of the rubber member 1G. Thereby, since the sphere can be rotated following the deformation of the rubber member 1G, the deformation of the rubber member 1G can be effectively prevented from being hindered.

  In addition, the unvulcanized rubber member 1G tends to be more easily deformed as the indoor temperature increases. For this reason, in step S3, when the rubber member 1G is deformed with time, it is desirable that the room temperature is higher than room temperature (20 to 30 ° C.). The indoor temperature is preferably set to 40 to 70 ° C., for example.

  Next, the deformation amount of the deformed rubber member 1G is measured (step S4). In this embodiment, in step S3, the rubber member 1G can be deformed earlier than in the prior art, so that the measurement of the deformation amount of the rubber member 1G can be started quickly. Further, since the rubber member 1G does not hinder the deformation of the rubber member 1G, the deformation amount of the rubber member 1G can be accurately measured.

  The deformation amount of the rubber member 1G is, for example, as shown in FIG. 2, when the rubber member 1G is formed in a rectangular shape (rectangular shape), the longitudinal direction has a large deformation amount (length) compared to the short direction. It is desirable to be measured in The deformation amount of the rubber member 1G is preferably measured based on a pair of parallel lines 17 and 17 (shown in FIG. 2) preliminarily written on the surface of the rubber member 1G before being deformed in step S3. . As a result, even when the rubber member 1G is deformed and the parallel lines 17 and 17 are distorted, for example, by measuring the shortest distance between the parallel lines 17 and 17, the deformation amount of the rubber member 1G can be reduced. It can be measured quantitatively.

  Next, it is determined whether or not the deformation amount of the rubber member 1G is within an allowable range (step S5). In this step S5, when it is determined that the deformation amount of the rubber member 1G is within the allowable range, the rubber member 1G is continuously manufactured with the current setting of the rolling device 2. On the other hand, when it is determined that the deformation amount of the rubber member 1G is outside the allowable range, the rolling device 2 is adjusted or improved so that the deformation amount of the rubber member 1G becomes small (step S6), and steps S1 to S5. Will be implemented again. Thereby, in this embodiment, the deformation amount of the rubber member 1G can be maintained within an allowable range. The adjustment or improvement of the rolling device 2 is performed, for example, by adjusting the moving speed of the rubber member 1G in the cooling unit 4 and the winder unit 5 according to a conventional method.

  In the present embodiment, the unvulcanized rubber member 1G formed in a sheet shape is exemplified as the member 1 to be measured, but may be formed in a block shape, for example. Furthermore, the member 1 is not limited to the unvulcanized rubber member 1G having adhesiveness, and may be, for example, a gel or a resin. In the measuring method of the present invention, the friction reducing means 8 for reducing the friction coefficient is disposed between the member 1 and the support base 7 as described above, so that the deformation amount of the member 1 can be measured quickly and accurately. Can do.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

  According to the processing procedure shown in FIG. 3, friction reducing means (powder) for reducing the friction coefficient is disposed between the unvulcanized rubber member and the support base on which the rubber member is placed, and the rubber member is Deformed over time. And until 120 minutes passed from the start of deformation, the deformation amount of the rubber member was measured a plurality of times (Example). The amount of deformation is measured based on the length of the rubber member in the longitudinal direction.

For comparison, the rubber member was deformed over time without the friction reducing means (powder). And until 120 minutes passed from the start of deformation, the deformation amount of the rubber member was measured a plurality of times (comparative example). And in the Example and the comparative example, the deformation amount of the rubber member was compared. The common specifications are as follows.
Rubber material:
Natural rubber (NR): RSS # 3 (60 parts by mass)
Styrene butadiene rubber (SBR): SBR1502 (40 parts by mass) manufactured by Sumitomo Chemical Co., Ltd.
Carbon black: Carbon black N326 (50 parts by mass) manufactured by Showa Cabot Corporation
Process oil: Diana process PS32 (4 parts by mass) manufactured by Idemitsu Kosan Co., Ltd.
Anti-aging agent 6C: Antigen 6C (N- (1,3-dimethylbutyl) -N′-phenyl-p-phenylenediamine) (2 parts by mass) manufactured by Sumitomo Chemical Co., Ltd.
Stearic acid: Koji (2.5 parts by mass) manufactured by NOF Corporation
Zinc flower: 2 types of zinc oxide (3.5 parts by mass) manufactured by Mitsui Mining & Smelting Co., Ltd.
Sulfur: Powdered sulfur (2 parts by mass) manufactured by Karuizawa Sulfur Co., Ltd.
Vulcanization accelerator: Noxeller NS (N-tert-butyl-2-benzothiazolylsulfenamide) (2 parts by mass) manufactured by Ouchi Shinsei Chemical Co., Ltd.
Longitudinal length L1: 1000 mm
Length L2 in the short direction: 400mm
Thickness W1: about 5 mm Contact area S between the member and the support base S: 400000 mm ²
Friction reducing means (powder): Softon 2200 manufactured by Shiroishi Calcium Co., Ltd.
Average particle radius r: 0.0005 mm
Mass of one particle m: 1 × 10 ⁻⁹ g
Mass of dispersed powder: 700 g (≧ m × S / (πr ² ): 509 g)
Indoor temperature: 30 ° C

  FIG. 9 shows a graph showing the relationship between the deformation amount of the example and the comparative example and the measurement time. As a result of the test, in the comparative example, the time required for the deformation amount to reach 3% was 120 minutes. On the other hand, in the example, the time required for the deformation amount to reach 3% was about 15 minutes. Therefore, the Example was able to confirm that the rubber member could be deformed earlier than the comparative example, and the amount of deformation of the rubber member could be measured quickly and accurately.

1 member 7 support base 8 friction reducing means

Claims (4)

A method for measuring the amount of deformation of a member having temporal deformation characteristics,
Arranging a friction reducing means for reducing a friction coefficient between the member and the support base between the member and the support base on which the member is placed, and deforming with time ;
Measuring the amount of deformation of the member deformed over time,
The friction reducing means is a sphere that rotates with the deformation of the member.
A method for measuring a deformation amount of a member . The method according to claim 1, wherein the member has adhesiveness. The method according to claim 1 or 2, wherein the member is an unvulcanized rubber member. The method for measuring a deformation amount of a member according to any one of claims 1 to 3, wherein the member has a sheet shape.

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