JP5818720B2 - Rubber cutting method - Google Patents

Description

  The present invention relates to a rubber cutting method.

  Conventionally, collection of a sample from a thick or large rubber member such as a fender is difficult by manual operation using a knife or the like, and thus has been performed by excision with a wire cutter or a chain saw (see Patent Document 1). ).

JP 2012-37380 A

  However, in the excision with a chain saw or the like, the physical properties of rubber change due to frictional heat, so that it is difficult to obtain a desired sample. If the cutting speed is reduced to suppress the heating of the rubber, the working efficiency is lowered.

  Also, if you want to cut out only the middle part of the rubber member, to use a chainsaw etc., it is a process of making a hole of a size that the cutter once passes, and then cutting it after passing the cutter through the hole, The man-hour is large.

  In view of the above fact, an object of the present invention is to improve the cutting efficiency while suppressing the modification of rubber due to frictional heat.

  The invention of claim 1 includes a first step of forming a plurality of through holes penetrating from one end side to the other end side in the thickness direction of the rubber member along the outer edge of the portion to be cut of the rubber member; A second step of inserting the string-like member into the two through holes so that the member straddles two through holes adjacent to each other among the plurality of through holes on the other end side in the thickness direction; A third step of applying the second step to two through holes adjacent to each other in a combination different from the two through holes, using a string member different from the string member; Grasping the end portions of the string-like member extending from the one end side in the second step and the third step, respectively, and pulling out from the other end side toward the one end side, the two through holes And a fourth step of cutting the intermediate portions.

  In the rubber cutting method according to claim 1, a plurality of through holes are formed in the rubber member, and a portion between the two through holes adjacent to each other is cut with a string-like member, whereby the cut target portion of the rubber member is formed. Since cutting is performed, generation of frictional heat during cutting is suppressed as compared with the case of using a chain saw or the like. For this reason, the modification | denaturation of the rubber | gum by friction heat can be suppressed.

  Moreover, since the through-hole formed in a rubber member should just be the magnitude | size which a string-like member passes, the man-hour required for formation of this through-hole is small. Furthermore, the cutting | disconnection efficiency of a rubber member can be improved by cut | disconnecting the part between two through-holes in a some combination with a respectively separate string member.

  According to a second aspect of the present invention, in the rubber cutting method according to the first aspect, an interval between the two through holes is set to 25 mm to 45 mm.

  Here, if the interval between the through holes is less than 25 mm, drilling with a drill or the like is difficult, and if the interval between the through holes is 45 mm or more, the pulling force of the string-like member increases.

  In the rubber cutting method according to claim 2, since the interval between the two through holes adjacent to each other is appropriately set, the formation of the through hole in the rubber member and the cutting of the rubber member by the string-like member are efficiently performed. It can be carried out.

  As described above, according to the rubber cutting method according to the first aspect of the present invention, it is possible to obtain an excellent effect that cutting efficiency can be improved while suppressing modification of rubber due to frictional heat. .

  According to the rubber excision method of the second aspect, it is possible to obtain an excellent effect that the formation of the through hole and the excision of the rubber member by the string-like member can be efficiently performed.

(A) It is sectional drawing which shows a 1st process and an example of a 2nd process. (B) It is sectional drawing which shows the other example of a 2nd process. (C) It is sectional drawing which shows a 3rd process. (D) It is sectional drawing which shows a 4th process. It is a front view which shows the state which looked at the rubber member by which the string-shaped member was penetrated to the mutually adjacent two through holes from the other end side of the thickness direction of this rubber member. It is a front view which shows the state which looked at the rubber member in FIG. 2 from the one end side of the thickness direction of this rubber member. It is a perspective view which shows the rubber member and the sample cut out from this rubber member.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. 1A to 1D, the rubber cutting method according to this embodiment includes a first step S1, a second step S2, a third step S3, and a fourth step S4. doing.

  In FIG. 1A, in the first step S1, for example, a tool 30 such as a drill is used along the outer edge of the portion 12 to be cut of the rubber member 10 from the one end 10A side in the thickness direction of the rubber member 10. A plurality of through holes 14 penetrating to the end 10B side are formed. At this time, the interval P between the two through holes 14 is set to 25 mm to 45 mm. When the interval P between the through holes 14 is less than 25 mm, the tool 30 advances in a direction with a low reaction force, and the holes are formed obliquely, so that the drilling process is difficult. Moreover, when the space | interval P of the through-hole 14 is 45 mm or more, the drawing-out force of the string-like member 16 increases.

  In the illustrated example, the tool 30 is disposed on the other end 10B side in the thickness direction of the rubber member 10, and the through hole 14 is drilled from the other end 10B side to the one end 10A side. Conversely, perforation may be performed from the one end 10A side toward the other end 10B side.

  In FIG. 1A, in the second step S <b> 2, the string-like member 16 is inserted into the two through holes 14. At this time, the string-like member 16 extends over two through holes 14A and 14B adjacent to each other among the plurality of through holes 14 on the other end 10B side in the thickness direction. Specifically, after the string-like member 18 is inserted into one through hole 14A, the portion extending from the other end 10B side is folded back in the direction of arrow A and inserted into the other through hole 14B in the direction of arrow B. To do. As shown in FIG. 1B, the string-like member 18 may be bent in a U shape in advance and inserted from the other end 10B side to the one end 1OA side in the arrow C direction. As the string-like member 18, for example, a rope or a wire is used.

  In FIG. 1C, in the third step S3, two string-like members 18, 20, and 22 (see FIG. 2 and FIG. 3 for the string-like member 22) different from the string-like member 16 are used. The second step S2 is performed on each of the two through holes 14 adjacent to each other, which is a different combination from the two through holes 14A and 14B. Specifically, the string member 18 is inserted so as to straddle the through holes 14B, 14C, the string member 20 is inserted so as to straddle the through holes 14C, 14D, and the string so as to straddle the through holes 14D, 14E. The member 22 is inserted (see FIGS. 2 and 3). At this time, the string-like members 18, 20, 22 are made to straddle between the through holes 14 on the other end 10 </ b> B side in the thickness direction of the rubber member 10.

  In FIG. 1D, in the fourth step S4, the string-like members 16, 18, 20, and 22 extending from the one end 10A side in the second step S2 and the third step S3 (for the string-like member 22) 2, (see FIG. 2 and FIG. 3 for the end portion 22E), and the direction from the other end 10B side to the one end 10A side (arrow D). The portion between the two through holes 14 is cut by a shearing force. When cutting, the ends 16E of the string-like member 16 may be alternately pulled to perform sawing.

  In order to perform cutting efficiently, it is desirable to apply a contact plate 28 straddling the part to be cut 12 and the surrounding area to the surface of the rubber member 10 on the one end 10A side. As shown in FIG. 3, the contact plate 28 suppresses unnecessary deformation of the rubber at the time of cutting, and the string-like members 16, 18, 20, and 22 are interposed in order to suppress the roughening of the cut surface 24. It is desirable to arrange a pair so as to sandwich.

  Here, the gripping of the end portions 16E, 18E, 20E, and 22E means gripping by an operator (not shown), gripping by a gripping device (not shown), and further, the end portions 16E, 18E, 20E, and 22E pass through. It includes locking and fixing to the rubber member 10 or another member (not shown) so as not to come out of the hole 14. Taking the string-like member 16 as an example, one end portion 16E is locked to the rubber member 10 or an arbitrary member (for example, the contact plate 28), and the other end portion 16E is pulled to be cut. It may be.

  In the rubber cutting method according to the present embodiment, a plurality of through holes 14 are formed in the rubber member 10, and portions between two adjacent through holes 14 are cut by the string-like members 16, 18, 20, and 22, respectively. Thereby, since the part 12 to be cut of the rubber member 10 is cut, the generation of frictional heat at the time of cutting is suppressed as compared with the case of using a chain saw or the like. For this reason, the modification | denaturation of the rubber | gum by friction heat can be suppressed. Therefore, by using the rubber cutting method according to this embodiment, a desired sample 26 can be easily collected from a thick or large rubber member 10 such as a fender as shown in FIG. it can.

  Since the through-hole 14 formed in the rubber member 10 only needs to have a size through which the string-like member 16 passes, the through-hole 14 is formed in comparison with a case where a wide through-hole for passing a blade portion such as a chain saw is formed. The number of steps required to form 14 is small. Furthermore, the cutting | disconnection efficiency of the rubber member 10 can be improved by cut | disconnecting the part between the two through-holes 14 in a some combination with the separate string-like members 16, 18, 20, and 22, respectively.

  Furthermore, in this embodiment, since the interval P between the two through holes 14 adjacent to each other is appropriately set, the formation of the through holes 14 with respect to the rubber member 10 and the excision of the rubber member 10 with the string members 16 are efficient. Can be done automatically.

  In addition, in the said embodiment, although the part between the two through-holes 14 in a some combination shall be cut | disconnected by separate string-like members 16, 18, 20, and 22, respectively, it is not restricted to this, A portion between two adjacent through holes 14 may be cut one by one using one string-like member 16. Further, the string-like member 16 or the like may be inserted through all the combinations of the two through holes 14 adjacent to each other so that the excision target portion 12 may be excised at a time.

  Moreover, although the space | interval P of the two adjacent through-holes 14 shall be set to 25 mm-45 mm, the space | interval P is not necessarily restricted to this. The interval P may be set outside this numerical range according to the material and thickness of the string-like member 22, the hardness of the rubber member 10, the size of the through hole 14, and the like.

DESCRIPTION OF SYMBOLS 10 Rubber member 10A One end 10B The other end 12 The part to be excised 14 Through hole 14A Through hole 14B Through hole 14C Through hole 14D Through hole 14E Through hole 16 String member 16E End 18 String member 18E End 20 String member 20E End Part 22 String-like member 22E End part P interval S1 First step S2 Second step S3 Third step S4 Fourth step

Claims (2)

A first step of forming a plurality of through holes penetrating from one end side to the other end side in the thickness direction of the rubber member along the outer edge of the part to be cut of the rubber member;
A second step of inserting the string-like member through the two through holes so that the string-like member straddles two adjacent through holes among the plurality of through holes on the other end side in the thickness direction; ,
A third step of applying the second step to two mutually adjacent through holes that are in a different combination from the two through holes, using a string member different from the string member;
The two through holes are formed by gripping the end portions of the string-like members extending from the one end side in the second step and the third step, respectively, and pulling out from the other end side toward the one end side. A fourth step of cutting each part between
A rubber cutting method.   The rubber cutting method according to claim 1, wherein an interval between the two through holes is set to 25 mm to 45 mm.

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