JP2016007657A - Device and method for hollowing unvulcanized rubber sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for hollowing an unvulcanized rubber sheet capable of reliably and quickly hollowing an objective portion of the unvulcanized rubber sheet.SOLUTION: An unvulcanized rubber sheet S is loaded on a loading stand 2, a hollowing blade 5 a lower end of which is arranged as a blade tip 6 on an upper position of the loading stand 2 is relatively subjected to plane movement for the loading stand 2, an objective portion St of the unvulcanized rubber sheet S is positioned and fixed on a lower position of the blade tip 6, subsequently, the blade tip 6 is moved downward toward the unvulcanized rubber sheet S and is rotated while setting an axial core direction of the hollowing blade 5 which vertically extends crossing an upper surface of the loading stand 2 as the rotation axial direction and the objective portion St is hollowed by the blade tip 6.

Description

  The present invention relates to an unvulcanized rubber sheet hollowing apparatus and method, and more particularly to an unvulcanized rubber sheet hollowing apparatus and method capable of reliably and quickly hollowing out a target portion.

  In the process of manufacturing a rubber product, an unvulcanized rubber sheet may be used. For example, when a tire is manufactured, an unvulcanized rubber sheet is extruded from an extruder in order to form members such as tread rubber, side rubber, and inner liner in a molding process. These unvulcanized rubber sheets rarely contain foreign matter or different types of rubber. In such a case, the present situation is that unnecessary portions mixed with foreign matters are removed using a cutter or scissors. Since unvulcanized rubber has strong adhesiveness, it is not so easy to cut off unnecessary portions. If the sheet thickness is increased, a lot of labor is required for the cutting operation.

  Further, for rubber sampling, a sample and a predetermined size may be taken out from the unvulcanized rubber sheet. In this case as well, a large amount of labor may be required for the work as in the case described above.

  Although not intended for removing unnecessary parts from the unvulcanized rubber sheet or for sampling, an apparatus for producing a rubber product by punching the unvulcanized rubber sheet into a product shape has been proposed (Patent Document 1). reference). This apparatus has a pressing mechanism, and it seems that the rubber sheet is punched by pressing (pressing) the punching blade (punching die) against the unvulcanized rubber sheet (see paragraph 0014).

  As described above, when the rubber sheet is punched by simply pressing the punching blade against the unvulcanized rubber sheet, it is not possible to cleanly cut off when the unvulcanized rubber sheet has high adhesiveness. For example, it becomes difficult for a rubber sheet to adhere to a punching blade and punch into a predetermined shape. Therefore, in the apparatus of Patent Document 1, the unvulcanized rubber sheet is cooled to room temperature before punching to reduce the adhesiveness (see paragraph 0012). Therefore, it takes time to punch out the target portion in the unvulcanized rubber sheet, and it is difficult to punch out reliably and quickly.

Japanese Patent Laid-Open No. 2000-25033

  An object of the present invention is to provide an unvulcanized rubber sheet hollowing apparatus and method capable of reliably and quickly hollowing out a target portion of an unvulcanized rubber sheet.

  In order to achieve the above object, an unvulcanized rubber sheet punching device according to the present invention includes a mounting table on which an unvulcanized rubber sheet is mounted, and a cutting blade disposed at a position above the mounting table with a lower end as a cutting edge. A vertical movement mechanism for moving the cutting edge close to and away from the upper surface of the mounting table, and rotating the cutting edge with the axial direction of the hollowed blade extending perpendicularly to the upper surface of the mounting table as a rotation axis direction. A rotating mechanism, wherein the mounting table moves to an arbitrary plane position relative to the hollow blade, and the relative position is fixed at the moved arbitrary plane position. To do.

  The unvulcanized rubber sheet cutting method according to the present invention is a method in which an unvulcanized rubber sheet is placed on a mounting table, and a cutting blade arranged with the lower end as a cutting edge at an upper position of the mounting table is placed on the mounting table. The target part of the unvulcanized rubber sheet is positioned and fixed at a lower position of the blade edge, and then the blade edge is moved downward toward the unvulcanized rubber sheet. At the same time, the cutting edge is rotated with the axial center direction of the cutting blade extending vertically extending perpendicularly to the upper surface of the mounting table as the rotation axis direction, and the target portion is cut out by the cutting edge.

  According to the present invention, the cutting edge of the cutting blade is moved downward toward the unvulcanized rubber sheet placed on the mounting table, and the cutting edge extends in the axial direction perpendicular to the upper surface of the mounting table. Is rotated in the direction of the rotation axis to cut out the target part of the unvulcanized rubber sheet, so even if the unvulcanized rubber sheet is highly sticky, it is compared to simply pressing the blade edge. Can be cut out reliably and quickly. In addition, since the target part of the unvulcanized rubber sheet can be positioned and fixed at the lower position of the blade edge by moving the cutting blade relative to the mounting table, the target part can be quickly cut out. It has become more and more advantageous.

It is a side view which illustrates the punching apparatus of the unvulcanized rubber sheet of this invention. It is a top view of the hollowing apparatus of FIG. It is explanatory drawing which illustrates the structure by seeing through the inside of a hollow blade. It is explanatory drawing which expands and illustrates the blade edge of FIG. It is explanatory drawing which illustrates the hollow blade which cuts the target site | part of the unvulcanized rubber sheet in a cross sectional view. It is explanatory drawing which illustrates the hollow blade which has discharged | emitted the hollow part in sectional view. It is explanatory drawing which shows the modification of a hollow blade by planar view. It is explanatory drawing which illustrates the structure by seeing through the inside of the hollow blade of FIG. It is explanatory drawing which shows another modification of a hollow blade by planar view. It is explanatory drawing which illustrates the structure by seeing through the inside of the hollow blade of FIG.

  Hereinafter, the unvulcanized rubber sheet cutting apparatus and method of the present invention will be described based on the embodiments shown in the drawings.

  The unvulcanized rubber sheet punching device 1 of the present invention illustrated in FIGS. 1 to 4 (hereinafter referred to as the hollowing device 1) is a device that punches out a target portion St in the unvulcanized rubber sheet S. Examples of the unvulcanized rubber sheet S include a tread rubber, a side rubber, an inner liner, and the like that are constituent members of a pneumatic tire. Moreover, not only a pneumatic tire but the unvulcanized rubber sheet S used when manufacturing various rubber products becomes an object to which the present invention is applied. The target part St is a part where a foreign substance or a different kind of rubber is mixed (defective part), a part where rubber is sampled, or the like.

The hollowing device 1 includes a mounting table 2 on which an unvulcanized rubber sheet S is mounted, and a hollowing blade 5 that is disposed at a position above the mounting table 2 with a lower end as a blade edge 6. The size of the unvulcanized rubber sheet S placed on the placing table 2 is, for example, a length of 4 m or less and a width of 500 mm or less. The mounting table 2 is disposed on the table 4 via a vertical slide rail 4a and a horizontal slide rail 4b. The mounting table 2 of this embodiment is rectangular, and a protective sheet 2a made of, for example, vulcanized rubber is laid on the upper surface. The hollow blade 5 has a cylindrical shape, and is held by a frame 9 attached horizontally by a support column 9 a erected on the table 4 with the axial center direction being the vertical direction.

  The punching device 1 further includes a vertical movement mechanism 10 that moves the blade edge 6 close to and away from the upper surface of the mounting table 2, and the axial direction of the punching blade 5 that extends vertically with the blade edge 6 orthogonal to the upper surface of the mounting table 2. And a rotation mechanism 11 that rotates in the direction of the rotation axis. The hollow blade 5 held so as to be suspended from the frame 9 is moved up and down by a vertical movement mechanism 10 via a rotary shaft 5a which is joined to the upper end and extends vertically. Further, the hollow blade 5 is rotated by a rotation drive motor which is a rotation mechanism 11 through a rotation shaft 5a. The operations of the vertical movement mechanism 10 and the rotation mechanism 11 are controlled by the control unit 16.

In this embodiment, the frame 9 is provided with a water supply means 12 and an irradiator 13 that irradiates laser light or the like. The water supply means 12 includes a water tank 12a, a supply pipe 12b, and a nozzle 12c. The irradiator 13 irradiates the lower position of the blade edge 6 with a pinpoint.
Further, a prismatic holding portion 14 is suspended from the frame 9 so as to be vertically movable, and a detection sensor 15 is also installed. The detection sensor 15 detects the position of the target portion St in the unvulcanized rubber sheet S based on the color, unevenness, and the like of the unvulcanized rubber sheet S. The operations of the water supply means 12, the irradiator 13, and the pressing unit 14 are also controlled by the control unit 16.

  The mounting table 2 moves smoothly in the extending direction along the vertical slide rail 4a, and moves smoothly in the extending direction along the horizontal slide rail 4b. That is, the planar position of the punching blade 5 is fixed, and the mounting table 2 is configured to be able to freely move on the plane. The planar position of the mounting table 2 can be fixed, and the punching blade 5 can be moved freely on the plane. In other words, any configuration may be used as long as the mounting table 2 moves to an arbitrary plane position relative to the cut-off blade 5 and the relative position is fixed at the moved arbitrary plane position.

  In this embodiment, the blade edge 6 is an annular blade 6a in plan view. An extrusion portion 7 and an urging member 8 that urges the extrusion portion 7 downward are provided on the inner peripheral side of the blade edge 6. As the urging member 8, various springs such as a coil spring, or an elastic body such as rubber or elastomer can be used.

  A partition plate 5b is provided inside the hollow blade 5 at a position halfway in the vertical direction. A central shaft 7 a extending upward is joined to the upper end of the extrusion portion 7. A locking wall 7b is fixed at a position in the middle of the center shaft 7a in the vertical direction, and a flange-like stopper 7c is joined to the upper end. The central shaft 7a passes through a through hole formed in the partition plate 5b. A biasing member 8 is interposed between the partition plate 5b and the locking wall 7b. Thereby, the pushing portion 7 is always urged downward by the urging member 8. The urged extruding part 7 is in a state of protruding downward from the blade edge 6. The pushing portion 7 is configured to move upward from the blade edge 6 by pressing upward.

  The cutting edge 6 has a tapered tip in a sectional view. The cutting edge length H is, for example, 3 mm to 6 mm, and the tip thickness T of the cutting edge 6 is, for example, 0.3 mm to 1 mm. The inner diameter D of the blade edge 6 is, for example, 10 mm to 30 mm.

  In order to cut out a target portion St in the unvulcanized rubber sheet S using the hollowing device 1, first, the unvulcanized rubber sheet S is laid flat on the upper surface (protective sheet 2a) of the mounting table 2. Next, the mounting table 2 is moved in a plane with respect to the punching blade 5 disposed at the upper position of the mounting table 2 to position the target portion St at the lower position of the blade edge 6.

  At this time, the irradiation machine 13 may irradiate the lower position of the blade edge 6 with a pinpoint. Thereby, when the mounting table 2 is moved in a plane so that the target part St is moved toward the irradiated position, the target part St can be accurately and quickly positioned at the lower position of the blade edge 6. The planar movement of the mounting table 2 can also be performed manually. However, when the detection sensor 15 is provided as in this embodiment, based on the detection data of the detection sensor 15 that detects the position of the target part St. The planar movement of the mounting table 2 can also be controlled by the control unit 16. By this control, the target portion St is positioned at a position below the blade edge 6.

  Next, the pressing portion 14 waiting at the standby position is moved downward to press the surface of the unvulcanized rubber sheet S appropriately. Thereby, the relative position in the plane of the blade edge 6 and the mounting table 2 is fixed, and the target site St is reliably positioned at the lower position of the blade edge 6.

  Next, as illustrated in FIG. 5, the blade edge 6 is moved downward by the up-and-down moving mechanism 10 to a position penetrating the unvulcanized rubber sheet S, and the blade edge 6 is moved around the rotation shaft 5 a by the rotation mechanism 11. Rotate. At this time, the target portion St can be surely and rapidly cut out into a circular shape from the unvulcanized rubber sheet S by the punching shear force and the rotational force generated by the blade edge 6.

  The rotational speed of the blade edge 6 is set to 400 rpm or less, for example. When the rotational speed exceeds 400 rpm, friction with the unvulcanized rubber sheet S becomes excessive, and vulcanization may proceed. On the other hand, when the rotational speed is less than 60 rpm, it becomes difficult to reliably and quickly cut out the target portion St due to insufficient rotational shearing force. If water is supplied from the water supply means 12 to the blade edge 6 and the target portion St is cut out, the progress of vulcanization of the unvulcanized rubber sheet S can be suppressed. Further, when the unvulcanized rubber sheet S (target portion St) is cooled in this manner, the adhesiveness of the unvulcanized rubber sheet S is reduced and the hardness is increased, so that it is easy to cut out.

  At the time of this hollowing, the extruding part 7 is pressed upward by the unvulcanized rubber sheet S. Therefore, it is in a state where it has moved above the blade edge 6 against the urging force of the urging member 8. The target portion St is in contact with the lower surface of the pushing portion 7.

  After hollowing out the target portion St, the blade edge 6 (the hollow blade 5) is moved upward by the vertical movement mechanism 10 as illustrated in FIG. When the blade edge 6 is moved upward, the pushing portion 7 protrudes below the blade edge 6 by the urging force of the urging member 8. Along with this, the cut out target portion St is automatically discharged downward from the blade edge 6. For this reason, the target portion St that is cut out is prevented from clogging the inside of the cutout blade 5, so that maintainability is facilitated.

  In the above embodiment, the blade edge 6 is a single annular blade 6a. As illustrated in FIGS. 7 and 8, a plurality of annular blades 6a are arranged coaxially, and the plurality of annular blades are arranged. Arbitrary annular blade 6 a among 6 a can be moved up and down by vertical movement mechanism 10 and can be configured to be rotatable by rotation mechanism 11.

  In the hollow blade 5 illustrated in FIGS. 7 and 8, two annular blades 6 a are arranged coaxially. The annular blade 6a on the outer peripheral side moves up and down relative to the annular blade 6a on the inner peripheral side, and can protrude downward from the annular blade 6a on the inner peripheral side.

  When this blade edge 6 is employed, one annular blade 6a having a size that best matches the size of the target portion St among the plurality of annular blades 6a is moved to the lowest position by the vertical movement mechanism 10. In addition, the target portion St is cut out by being rotated by the rotation mechanism 11. Thereby, it is possible to avoid hollowing out an extra portion other than the target portion St from the unvulcanized rubber sheet S. That is, it is advantageous to improve the material yield of the unvulcanized rubber sheet S.

  The blade edge 6 is not limited to the annular blade 6a in plan view, but can be divided blades 6b arranged on the circumference at intervals in the circumferential direction in plan view as illustrated in FIGS. 9 and 10. . These divided blades 6b are configured to be movable in the radial direction of the arranged circles.

  The hollow blade 5 has a disk-like flange portion 5c protruding on the outer peripheral side at a position halfway in the vertical direction. A guide groove 5d extending from the inner peripheral side to the outer peripheral side is formed on the lower surface of the flange portion 5c. The divided blade 6b moves along each guide groove 5d. The divided blade 6b that has moved is configured to be fixed at an arbitrary position.

  When this blade edge 6 is employed, the divided blade 6b is moved in the radial direction to a position that most closely matches the size of the target portion St. Next, in this state, the split blade 6b is moved downward by the up-and-down moving mechanism 10 and rotated by the rotating mechanism 11, thereby hollowing out the target portion St. Thereby, it is possible to avoid hollowing out an extra portion other than the target portion St from the unvulcanized rubber sheet S. That is, it is advantageous to improve the material yield of the unvulcanized rubber sheet S.

  According to the cutting edge 6b illustrated in FIGS. 9 and 10, the outer diameter of the unvulcanized rubber sheet S can be arbitrarily set steplessly. Therefore, it becomes more and more advantageous to improve the material yield of the unvulcanized rubber sheet S.

DESCRIPTION OF SYMBOLS 1 Cutout device 2 Mounting base 2a Protection sheet 3 Table 4a Vertical slide rail 4b Horizontal slide rail 5 Cutout blade 5a Rotating shaft 5b Partition plate 5c Flange part 5d Guide groove 6 Cutting edge 6a Annular blade 6b Split blade 7 Extrusion part 7a Center Shaft 7b Locking wall 7c Stopper 8 Biasing member 9 Frame 9a Post 10 Vertical movement mechanism 11 Rotating mechanism 12 Water supply means 12a Water tank 12b Supply pipe 12c Nozzle 13 Irradiator 14 Holding part 15 Detection sensor 16 Control part S Unvulcanized Rubber sheet St Target area

Claims (12)

  A mounting table on which the unvulcanized rubber sheet is mounted, a hollow blade disposed at the upper position of the mounting table with the lower end as the cutting edge, and a vertical movement mechanism that moves the cutting edge close to and away from the upper surface of the mounting table; A rotating mechanism that rotates the cutting edge with the axial center direction of the cutting blade extending perpendicularly to the top surface of the mounting table as a rotation axis direction, the mounting table being relatively relative to the cutting blade An unvulcanized rubber sheet punching device, wherein the unvulcanized rubber sheet is moved to an arbitrary plane position and the relative position is fixed at the moved arbitrary plane position.   The cutting edge is an annular blade in plan view or a plurality of divided blades arranged on the circumference at intervals in the circumferential direction, and an extruding part arranged on the inner peripheral side of the cutting edge, and the extruding part below The pushing portion biased by the biasing member protrudes downward from the cutting edge, and pressing the pushing portion upward causes the pushing portion to move more than the cutting edge. The unvulcanized rubber sheet punching device according to claim 1, which is configured to move upward.   The cutting edge is an annular blade in a plan view, and a plurality of the annular blades are coaxially arranged, and any of the plurality of annular blades is attached to the mounting table by the vertical movement mechanism. The unvulcanized rubber sheet punching device according to claim 2, wherein the unvulcanized rubber sheet punching device is configured to be moved close to and away from the upper surface and rotated by the rotating mechanism.   The said blade edge | tip is the division blade arrange | positioned on the circumference at intervals in the circumferential direction by planar view, It comprised so that it could move to the radial direction of the circle | round | yen of the circumference where these division blades were arrange | positioned. Unvulcanized rubber sheet punching device.   The unvulcanized rubber sheet punching device according to any one of claims 1 to 4, further comprising water supply means for supplying water to the cutting edge.   The unvulcanized rubber sheet punching device according to any one of claims 1 to 5, further comprising an irradiator that irradiates a position below the blade edge.   An unvulcanized rubber sheet is placed on a mounting table, and a punching blade arranged with the lower end as a blade edge at a position above the mounting table is moved relative to the mounting table in a plane to move the unvulcanized rubber sheet. The target part is positioned and fixed at a lower position of the cutting edge, and then the cutting edge is moved downward toward the unvulcanized rubber sheet, and the cutting edge is vertically moved perpendicular to the upper surface of the mounting table. A method for punching an unvulcanized rubber sheet, wherein the extending portion is rotated with an axial center direction of the cut blade as a rotation axis direction, and the target portion is cut out by the blade tip.   The blade tip is an annular blade in a plan view or a plurality of divided blades arranged on the circumference at intervals in the circumferential direction, and an extruding portion biased downward by a biasing member on the inner peripheral side of the blade tip In this state, the pushing portion is protruded downward from the cutting edge, and the target portion is cut out by the cutting edge in this state. When the cutting edge is moved upward after moving the cutting edge against the force and the cutting edge is moved upward, the pushing portion is protruded below the cutting edge by the urging force of the urging member. The unvulcanized rubber sheet cutting method according to claim 7, wherein the target portion cut out is discharged downward from the cutting edge.   The blade edge is an annular blade in plan view, and a plurality of the annular blades are coaxially arranged, and the size of the plurality of annular blades most closely matches the size of the target portion. The method for punching an unvulcanized rubber sheet according to claim 8, wherein the target portion is cut out using an annular blade.   The cutting edges are divided blades arranged on the circumference at intervals in the circumferential direction in a plan view, and these divided blades are moved in the radial direction of the circle of the arranged circumference, The method for punching an unvulcanized rubber sheet according to claim 8, wherein the target portion is cut out by using a split blade in this state, arranged at a position that most closely matches the size.   The method for hollowing out an unvulcanized rubber sheet according to any one of claims 7 to 10, wherein a target portion of the unvulcanized rubber sheet is hollowed out by the blade edge while supplying water to the blade edge.   The unvulcanized rubber sheet according to any one of claims 7 to 11, wherein a position below the blade edge is irradiated with an irradiator, and a target portion of the unvulcanized rubber sheet is aligned with the irradiated position. Hollow out method.

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