JP2009000758A - Grooving cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grooving cutter increasing a cutting speed in cutting the tread surface of a tire. <P>SOLUTION: The grooving cutter 1 for cutting a desired pattern groove on the surface of a rotating tire comprises: a core 2 made of a strip formed in a U shape; and a thin blade material 3 slidably covering around the core 2. The core 2 preferably serves as a heat source, and more preferably serves as the heat source by supplying electric power to the core 2. The thin blade material 3 vibrates preferably along the U shape of the core 2. Further, the grooving cutter 1 is preferably attached to the leading end of an arm of a grooving robot 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a grooving cutter, and more particularly to a grooving cutter that is attached to the tip of an arm of a grooving robot and cuts a desired pattern groove on an unvulcanized tire surface.

  Various apparatuses for forming pattern grooves on the tread surface of a vulcanized tire, retreaded tire or unvulcanized tire are known. For example, Patent Document 1 discloses a method for cutting a pattern groove having a desired inclination with respect to a vertical line perpendicular to a tangent at the center of a tread in a cross section of a tire red surface having a curved surface in an axial direction. An apparatus is disclosed.

  In recent years, a grooving robot equipped with a grooving cutter at the tip of the arm has been developed, and the grooving cutter at the tip of the arm is applied at a desired angle to the tread surface of the tire that is rotatably supported to form a desired pattern groove. Cutting is done.

  By the way, in molding of tires for large construction machines, it is known that the amount of rubber moved during vulcanization is large because the rubber volume is large and the pattern groove is also deep. Under such circumstances, when the tread rubber is wound into the vulcanizing pot, the groove portion is pushed by the hook mold and the belt inside the tire is pushed inward. Therefore, today, before putting such an unvulcanized tire into a vulcanizing pot, it is a common practice to cut the groove portion using the above-described grooving robot.

Such a grooving robot is equipped with an electric heating cutter, and this electric heating cutter is formed with a metal strip having a U-shape, and is heated by energizing the metal strip. Is cut.
JP-A-4-68137

  However, since the conventional grooving cutter presses the heated blade to cut the tire tread, there is a problem that the resistance is large and the cutting speed cannot be increased. Moreover, since the tread rubber is burned out with a heated cutter, it was necessary to heat the cutter body to a high temperature (for example, 200 ° C. or higher). Furthermore, the cut piece at the time of cutting may adhere to the blade of the grooving cutter, and the automatic operation of the grooving robot may be stopped.

  Therefore, an object of the present invention is to provide a grooving cutter capable of increasing the cutting speed of a tread surface of a tire.

  Another object of the present invention is to provide a grooving cutter capable of cutting at a high speed without heating the cutter body as high as ever.

  Furthermore, the other object of this invention is to provide the grooving cutter which can continue cutting, without the cut piece at the time of cutting adhering to a grooving cutter.

  As a result of intensive studies to solve the above problems, the present inventor has found that the object can be achieved by making the grooving cutter a double structure of a core material and a thin blade material covering the core material, and the present invention. It came to complete.

  That is, the grooving cutter of the present invention is a grooving cutter for cutting a desired pattern groove on the surface of a rotating tire, and a core material made of a U-shaped strip, and slides around the core material. It consists of the thin blade material which covers freely.

  As a result, only the core material can function as a heat source, and preferably, the core material can be used as a heat source by energizing the core material.

  Moreover, by cutting the thin blade material along the U-shape of the core material, the cut piece at the time of cutting can be continuously cut without adhering to the grooving cutter. Furthermore, the cutting speed can be increased without making the core material as hot as ever. That is, the cutting resistance can be lowered by vibrating the thin blade material of the grooving cutter, whereby the cutting speed can be increased and the cutting cycle time can be shortened. Moreover, since the frictional heat with a tire generate | occur | produces because the thin blade material of a grooving cutter vibrates, the temperature of the core material itself which is a heat source can be lowered.

  Since the size and overall shape of the grooving cutter of the present invention can be the same as those of a known grooving cutter, it can be suitably attached to the arm tip of a known grooving robot.

  According to the grooving cutter of the present invention, it is possible to perform cutting at a high speed without heating the cutter body as high as ever. Moreover, it can continue cutting without the cut piece at the time of cutting adhering to a grooving cutter. Furthermore, it can be suitably attached to the arm tip of a known grooving robot.

Hereinafter, embodiments of the present invention will be specifically described.
FIG. 1 shows a grooving cutter 1 according to an embodiment of the present invention mounted on the tip of an arm of a grooving robot. The grooving cutter 1 is mounted on the grooving robot 10 so that a desired pattern groove can be cut on the tread surface of the rotating tire 20. As the basic structure itself of the grooving robot 10, a known structure can be adopted and it should not be particularly limited.

  As shown in FIG. 2, the grooving cutter 1 according to an embodiment of the present invention includes a core material 2 formed of a U-shaped strip and a thin blade material 3 covering the periphery of the core material 2. In this case, the thin blade material 3 is slidable with respect to the core material 2 and is vibrated along the U-shape of the core material 2 by a pair of vibration means 4 provided at both ends of the U-shape. preferable. That is, as shown in FIG. 3 by enlarging the portion indicated by A in FIG. 2, the thin blade material 3 covers the periphery of the core material 2 so as to be slidable so that the rubber does not adhere to the thin blade material 3. Only the thin blade material 3 can be vibrated. In addition, the vibration means 4 can be based on the effect | action of the cam which incorporates a small motor (not shown) in any one or both, for example.

  Moreover, it is preferable to use the core material 2 as a heat source by energizing it. Examples of the core material 2 include known materials that can be used as a heat source when energized, for example, alloys such as nichrome materials, ceramic materials, or heat-resistant resins such as fluororesins added with carbon black or graphite. Moreover, as a material of the thin blade material 3, the stainless steel etc. which have been used as a material of the grooving cutter 1 until now can be used conveniently.

  The core material 2 is fixed to the tip of the arm of the grooving robot, and the thin blade material 3 is vibrated along the U-shape of the core material 2 by the vibration means 4 so that the cut piece when cutting is attached to the grooving cutter. You can continue cutting. At the same time, the core material 2 is energized from a power source (not shown) via an arm or an electric wire to generate heat to a desired temperature, thereby increasing the cutting speed without increasing the temperature as before. Can do.

  When molding a tire for a large construction machine, before putting the unvulcanized tire into the vulcanizing pot, the groove portion is cut using a grooving robot equipped with the grooving cutter of the present invention, thereby cutting speed. Can be significantly increased.

Hereinafter, the present invention will be described based on examples.
(Conventional example)
An existing grooving cutter made of a U-shaped stainless steel strip was attached to the arm tip of a known grooving robot. Next, this grooving cutter was heated to 250 ° C. by energization, and the tread of the rotating unvulcanized large construction machine tire was cut.

(Example)
Instead of the existing grooving cutter, the following grooving cutter of the present invention was mounted on the arm tip of a known grooving robot similar to the conventional one.
1) The external shape was substantially the same as the conventional grooving cutter.
2) The core material was nichrome, and the surrounding thin blade material was made of stainless steel.
Next, the core material of this grooving cutter is heated to 200 ° C. by energization, and the surrounding thin blade material is vibrated by the vibration means provided at both ends thereof, thereby rotating the tread of a tire for a large unvulcanized construction machine. A cutting process was performed.

  In the example, the unvulcanized rubber did not adhere to the grooving cutter during the cutting process, but in the conventional example, the operation was forced to be interrupted several times by the adhesion. In addition, compared with the conventional example, the working time of one cycle could be reduced to one third in the example.

It is explanatory drawing which shows the state with which the grooving cutter which concerns on one embodiment of this invention was mounted | worn with the tip of the grooving robot arm. It is sectional drawing of the grooving cutter which concerns on one embodiment of this invention. It is a perspective view which expands and shows the A part of the grooving cutter shown in FIG.

Explanation of symbols

1 Grooving cutter 2 Core material 3 Thin blade material 4 Vibration means 10 Grooving robot 20 Tire

Claims (5)

  In a grooving cutter for cutting a desired pattern groove on the surface of a rotating tire, it is composed of a core material made of a U-shaped strip and a thin blade material that slidably covers the periphery of the core material. Grooving cutter characterized by.   The grooving cutter according to claim 1, wherein the core material functions as a heat source.   The grooving cutter according to claim 2, wherein the core material is used as a heat source by energizing the core material.   The grooving cutter according to any one of claims 1 to 3, wherein the thin blade material vibrates along a U-shape of the core material.   The grooving cutter as described in any one of Claims 1-4 attached to the arm front-end | tip of a grooving robot.

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