JP2006289902A - Roundness measuring device of inner peripheral surface of mold for tyre vulcanization - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device capable of measuring the roundness of an inner peripheral surface of a mold in a practical operating condition in which the mold is fastened by a press of a tyre vulcanizing forming device. <P>SOLUTION: An upper part side plate 14, a lower part side plate 15, and tread segments 16 of a separate mold are incorporated in a container 13 closed by presses 11, 12 of the tyre vulcanizing molding device 10, the roundness measuring device 20 of an inner peripheral surface of the mold comprising the tread segments 16 arranged in an annular shape is set in a central part of an inner space surrounded by the separate mold, the roundness measuring device 20 is equipped with a tubular body 21 having a lower end opening, a securing part 22 projecting from the lower end outer peripheral surface of the tubular body 21 and fitted to and held by the fitting part 15a of the central opening part fringe of the lower side part plate 15, a driving means 25 arranged in the hollow space of the tubular body 21, and a noncontact displacement measuring device 26 rotatedly moved along the outer peripheral surface of the tubular body 21 by the driving means 25. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a device for measuring the roundness of an inner peripheral surface of a tire vulcanizing mold, and in particular, in a state where a split mold is actually set in a container installed in a tire press (tire vulcanizer). The present invention relates to an apparatus capable of measuring the roundness of an inner peripheral surface of a mold composed of arranged tread segments.

  A split mold is generally used as a tire vulcanizing mold. The split mold is divided into an upper side plate for forming both end surfaces of the tire, a lower side plate, a plurality of tread segments forming an outer peripheral surface, and a sector shoe for holding the tread segment from the outer surface side.

In radial tires, there is a close correlation between runout (RRO = Radial Run Out) and the roundness of the inner surface of the split mold (the inner surface with the tread segment set in an annular shape). Therefore, it is required that the inner peripheral surface of the mold has high accuracy roundness.
Set the split mold in the container equipped with the tire press, tighten it with the press, and measure the roundness of the mold inner peripheral surface in the operating state. Since the circularity is obtained, it is the most preferable measurement method.

  When the split mold is to be measured while being clamped with a press as described above, the measuring apparatus 2 is inserted through the central opening 1a of the lower side plate 1 of the split mold as shown in FIG. 2 must be fixed to the periphery of the central opening 1a of the lower side plate 1. In addition, the driving means 3 for rotationally driving the measuring device 2 needs to be arranged outside the central opening 1a of the lower side plate, and is connected to the wiring W1 connected to the sensor 4 and the like of the measuring device 2 and the driving means 3. The wiring W2 is also drawn out below the central opening 1a of the lower side plate 1.

  However, a center mechanism 5 for supplying a pressure heat medium to a bladder disposed along the mold surface of the split mold is disposed below the central opening 1a of the lower side plate 1. Therefore, the driving means 3 and the wirings W1. There arises a problem that W2 interferes with the center mechanism 5. As a result, conventionally, it has been very difficult to adopt a method for measuring the roundness of the inner peripheral surface of the split mold while the mold is closed by a press.

  In contrast to the above problem, the present applicant does not measure in an operating state in which a split mold is set in a press container of a tire vulcanization molding device in Japanese Patent Laid-Open No. 2002-257537 (Patent Document 1), A tread segment holder that can set the tread segment in a cylindrical alignment is provided, and a dedicated measuring device that measures the inner surface unevenness of the tread segment with a non-contact sensor in this set state is provided.

  Further, the present applicant sets a split mold in a container in Japanese Patent Application Laid-Open No. 2003-266445 (Patent Document 2), but provides a mold closing and clamping means dedicated to a measuring device that is not a press of a tire vulcanization molding device, In a state in which the container is tightened by the dedicated means, a dedicated measuring device is provided that measures the inner peripheral surface of the tread segment with a non-contact sensor set in the inner space of the mold, as in Patent Document 1.

In both Patent Documents 1 and 2, a split mold is set in a container that is clamped by a press of a tire vulcanization molding apparatus, and the roundness of the inner peripheral surface of the mold in an actual operation state is measured. Instead of measuring, it is set in a dedicated measuring device installed offline. That is, the roundness of the inner peripheral surface of the mold in the operating state in which the mold is closed with a press is not confirmed.
Since the container mounted on the press has a degree of freedom in operation, the roundness of the inner peripheral surface of the mold may be different from that measured with the dedicated measuring device offline, as affected by the press accuracy and container accuracy. There is sex. Therefore, there is a problem that even if the measurement is performed with these dedicated measuring devices, the roundness of the inner peripheral surface of the mold is not measured when the mold is closed with a press.

JP 2002-257537 A JP 2003-266445 A

  The present invention has been made in view of the above problems, and is a method for measuring the roundness of the inner peripheral surface of a mold in an operating state in which the mold is closed with a press of a tire vulcanizing apparatus, similar to the method shown in FIG. And the measuring device installed in the space inside the mold, which was a problem in that case, can be improved to allow interference with the center mechanism located below the center opening of the lower side plate of the mold. It is an object of the present invention to provide an apparatus capable of measuring the roundness of the inner peripheral surface of a mold in an actual operation state that is reduced as much as possible and easily closed by a press.

In order to solve the above-described problems, the present invention includes an upper side plate, a lower side plate, and a tread segment of a split mold in a container that is closed by a press of a tire vulcanization molding apparatus. In the central part of the enclosed internal space, a roundness measuring device for the inner peripheral surface of the mold consisting of the tread segments arranged in an annular shape is set,
The roundness measuring device includes a cylindrical main body having a lower end opening, a mounting portion that protrudes from the outer peripheral surface of the lower end of the cylindrical main body and is fitted and held in a fitting portion at a peripheral edge of the central opening of the lower side plate, A tire vulcanizing gold comprising: a driving means provided in a cavity of a cylindrical main body; and a non-contact displacement measuring device rotated and moved along the outer peripheral surface of the cylindrical main body by the driving means. A device for measuring the roundness of the inner peripheral surface of a mold is provided.

As described above, according to the present invention, a split mold is set in a container that is closed by a press of a tire vulcanization molding device, and the inside of the mold in an actual operating state including the influence of press accuracy and container accuracy is included. The roundness of the circumferential surface is measured.
At that time, the driving means that protrudes from the measuring device installed in the mold inner space of the above-described problem to the center mechanism has a main body of the measuring device as a cylinder having a cavity, and the driving means is accommodated in the cavity of the cylinder. By adopting such a configuration, interference with the center mechanism is eliminated.

  Specifically, the drive means includes a rotary drive device such as a motor with a brake and a servomotor, and an encoder for detecting a rotation angle connected to the rotary drive device. The rotary drive device and the encoder are supported by a support arm projecting from the cylindrical main body into a cavity, and a link driven to rotate by the rotary drive device is rotatably supported on the upper end of the cylindrical main body. A guide shaft is suspended downward from the tip of an arm projecting from the link, and a non-contact displacement measuring instrument such as a laser displacement meter is attached to the guide shaft.

It is preferable that power supply to the rotary drive device such as the motor and the encoder is not performed via wiring, but is performed by a battery housed in an internal cavity of the cylindrical main body.
With this configuration, it is not necessary to draw out the wiring from the lower side plate to the center mechanism, and it is possible to completely eliminate the interference with the center mechanism together with the housing of the motor and encoder in the internal cavity of the cylindrical body. . Therefore, when the measuring device is set inside the mold, it is not necessary to remove the center mechanism, and the roundness of the inner peripheral surface of the split mold in the actual operating state with the press closed can be measured.

  In addition, a wireless transceiver is accommodated in the hollow of the cylindrical body, and the drive control of the driving means is performed wirelessly, and detection data from the non-contact displacement measuring device can be wirelessly transmitted to an external personal computer. preferable.

  The height position of the non-contact displacement measuring device is set by attaching a stopper / spacer to the non-contact displacement measuring device, fitting the stopper / spacer up and down to the guide shaft, and attaching to the guide shaft. The stopper and stopper are magnetized with a magnet. Therefore, the measurement position by the non-contact displacement measuring device can be arbitrarily set by setting the height position of the fixing magnet attached to the guide shaft in advance.

Furthermore, the non-contact displacement measuring instrument magnetically attached to the guide shaft with a fixing magnet is moved to an arbitrary height position, so that the height position of the arm connected to the guide shaft can be controlled by the rotational drive means. It is preferable that the roundness of the inner peripheral surface of the mold can be measured at a plurality of positions including the crown portion, the shoulder portion, and the middle portion.
The height adjustment of the arm by the rotation driving means is, for example, using the rotation driving means as a motor, attaching a bevel gear to the output shaft of the motor via a clutch, and attaching a rack meshing with the bevel gear to the arm. The height position can be adjusted.

As described above, in the measuring apparatus of the present invention, the main body of the measuring apparatus is a cylindrical main body, the driving means is accommodated therein, and set in a container that is closed by the press of the tire vulcanizing apparatus. Even if the measuring device is installed inside the split mold, the center mechanism is not interfered with, so the press mold is closed without removing the center mechanism, and the actual operation including the effects of press accuracy and container accuracy is included. The roundness of the inner peripheral surface of the mold in the state can be measured.
Therefore, it is not necessary to provide a dedicated measuring device described in Patent Documents 1 and 2, and it is possible to easily measure the roundness of the inner peripheral surface of the mold in the actual operating state.

  In addition, the height position of the non-contact measuring device can be arbitrarily set, and if the height position can be changed to enable measurement at multiple positions including the crown, shoulder, and middle, The roundness can be set with higher accuracy, and the roundness of the tire to be manufactured can be increased to improve the quality.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show an embodiment of the present invention.
FIG. 1 shows a tire vulcanization molding apparatus 10, and an upper side plate 14 and a lower side plate 15 of a split mold are vertically opposed in a container 13 that is closed by presses 11 and 12 of the tire vulcanization molding apparatus 10. A plurality of tread segments 16 are incorporated in an annular arrangement along the periphery of the upper side plate 14 and the lower side plate 15. In addition, a roundness measuring device 20 that measures the roundness of the inner peripheral surface of the mold composed of the tread segments 16 arranged in an annular shape at the center of the internal space surrounded by the split molds 14, 15, 16 is provided. It is set.

  The roundness measuring device 20 is fitted and held in a cylindrical main body 21 having a lower end opening, and a fitting portion 15 a that protrudes from the outer peripheral surface of the lower end of the cylindrical main body 21 and is located at the peripheral edge of the central opening of the lower side plate 15. A mounting portion 22, a driving means 25 provided in the cavity of the cylindrical main body 21, and a non-contact displacement measuring device 26 that is rotationally moved along the outer peripheral surface of the cylindrical main body 21 by the driving means 25.

  Specifically, the cylindrical main body 21 of the roundness measuring device 20 has a substantially cylindrical shape, and the split die 14 is formed by fitting the mounting portion 22 provided on the outer peripheral surface of the lower end with the fitting portion 15 a of the lower side plate 15. , 15 and 16 are arranged in an internal space. At this time, the axial center of the cylindrical main body 21 and the axial center of the tread segment 16 arranged annularly are made to coincide.

  The drive means 25 is connected to a rotation drive device 23 composed of a motor with a brake or a servomotor for rotating the non-contact displacement measuring device 26, and the rotation drive device 23 via an electric wire 27, and the rotation angle of the non-contact displacement measuring device 26. And an encoder 24 for detecting. The rotary drive device 23 and the encoder 24 are supported by a support arm 28 projecting from the cylindrical main body 21 into a cavity, and are arranged in the cylindrical main body 21. A link 29 that is rotationally driven by a rotational drive device 23 is rotatably supported at the upper end of the cylindrical main body 21, and a guide shaft is attached to the distal end of an arm 30 that is attached to the upper surface of the link 29 and protrudes laterally. A non-contact displacement measuring device 26 including a laser displacement meter is attached to the guide shaft 31. The non-contact displacement measuring device 26 is attached to the guide shaft 31 via a stopper / spacer 32. Specifically, when the stopper / spacer 32 attached to the non-contact displacement measuring device 26 is fitted to the guide shaft 31 so as to be movable up and down, the stopper / spacer 32 is lowered by its own weight and attached to the required position of the guide shaft 31. It is magnetically attached to the fixing magnet 39 and fixed at the mounting position of the fixing magnet 39.

  Further, a battery 33 is housed in the cavity of the cylindrical main body 21 as a power source for the rotary drive device 23, the encoder 24, and the non-contact displacement measuring device 26. The rotary drive device 23, the encoder 24, Wires 34 and 35 connecting the battery 33 are wired. An electric wire (not shown) connecting the battery 33 and the non-contact displacement measuring device 26 is drawn out from the cylindrical main body 21 to the outside of the cylindrical main body 21 through the opening 21a provided at the upper end of the cylindrical main body 21 and wired. ing. This eliminates external wiring drawn out to the outside through the lower end opening of the cylindrical main body 21 and the central opening of the lower side plate 15 in order to supply power to the rotary drive device 23, the encoder 24 and the non-contact displacement measuring device 26. Therefore, in this embodiment, the center mechanism 17 for supplying the pressure heat medium to the bladder arranged along the mold surface of the split mold is provided below the central opening 15a of the lower side plate 15. Interference between the center mechanism 17 and the electric wire can be avoided.

Further, the wireless transceiver 36 is accommodated in the cavity of the cylindrical main body 21, and the wireless transceiver 36, the rotation drive device 23, the encoder 24, and the non-contact displacement measuring device 26 are connected to the communication lines 37, 38 (non-contact displacement measuring device). 26 is connected by a communication line (not shown). The wireless transmitter / receiver 36 wirelessly controls the driving means 25 from the outside, and wirelessly transmits the rotation angle of the non-contact displacement measuring device 26 detected by the encoder 24 and the detection data from the non-contact displacement measuring device 26 to the outside. To a personal computer (not shown).
For example, a waveform 40 as shown in FIG. 3 is displayed on the display unit of the personal computer by performing arithmetic processing (Fourier series analysis) on the detection data transmitted to the personal computer.

Next, a method for measuring the roundness of the inner peripheral surface of the tire vulcanization mold using the roundness measuring device 20 will be described.
First, the split mold upper side plate 14, lower side plate 15, and tread segment 16 are arranged in the container 13, and the roundness measuring device 20 has a cylindrical shape in the fitting portion 15 a at the periphery of the central opening of the lower side plate 15. The mounting portion 22 of the main body 21 is fitted, and the roundness measuring device 20 is set in the central portion of the internal space surrounded by the split molds 14, 15, 16. At this time, the non-contact displacement measuring device 26 is arranged at the measurement start position.
Next, the container 13 is closed with the presses 11 and 12 of the tire vulcanization molding apparatus 10, and the tire vulcanization molding apparatus 10 is brought into a state similar to the actual operation state.

Next, the driving means 25 is operated via the wireless transceiver 36, and measurement of the roundness of the inner peripheral surface of the tire vulcanization mold is started. The roundness of the inner peripheral surface of the mold may be measured at any position in the vertical direction, but by moving up and down a fixing magnet attached to the guide shaft 31 of the roundness measuring device 20 so as to be movable up and down, When the non-contact displacement measuring device 26 is moved in the vertical direction, the roundness of the inner peripheral surface of the mold can be measured at a plurality of positions including the crown portion, the shoulder portion, and the middle portion.
After the required time has elapsed, the rotation of the non-contact displacement measuring device 26 is stopped and the measurement is finished. The detection data measured by the non-contact displacement measuring instrument 26 is wirelessly transmitted to the personal computer by the wireless transmitter / receiver 36, and the transmitted detection data is subjected to arithmetic processing (Fourier series analysis) to be displayed on the display unit of the personal computer. A waveform is displayed and the roundness of the inner peripheral surface of the mold is confirmed.

  According to the said structure, it is set as the structure which accommodates the drive means 25 grade | etc., In the cylindrical main body 21 as the main body of the roundness measuring apparatus 20 of a metal inner peripheral surface, The press 11 of the tire vulcanization molding apparatus 10, 12, even if a measuring device is attached to the inside of the split molds 14, 15, 16 set in the container 13 which is closed in the mold 12, the center mechanism is not interfered with, so the press mold can be closed without having to remove the center mechanism. In addition, the roundness of the inner peripheral surface of the mold in the actual operation state can be measured including the influence of the press accuracy and the container accuracy.

FIG. 4 shows a modification of the embodiment of the present invention.
In this modification, the arm 30 of the roundness measuring device 20 can be moved up and down, and the height position of the non-contact displacement measuring device 26 can be arbitrarily set.
Specifically, a first bevel gear 42 that rotates in a horizontal plane is attached to the output shaft 41 of the rotation drive device 23 via a clutch (not shown), and the arm 30 meshes with the first bevel gear 42. A rack 44 that meshes with a second bevel gear 43 that rotates in a vertical plane is attached.
As a result, when the first bevel gear 42 is rotated by the rotation of the output shaft 41 of the rotation driving device 23, the second bevel gear 43 meshing with the first bevel gear 42 is rotated in the vertical plane, and the second bevel gear 42 is rotated. The rack 44 meshing with the gear 43 can be raised and lowered to adjust the height of the arm 30.
That is, in the above embodiment, when the height position of the non-contact displacement measuring device 26 is changed, the mounting position of the fixing magnet has to be changed. The height position of the non-contact displacement measuring instrument 26 can be changed.

  According to the above configuration, the arm 30 can be moved up and down, so that the height position of the non-contact displacement measuring device 26 can be arbitrarily set. Further, the crown position, the shoulder portion, and the middle portion can be changed by changing the height position. If measurement is possible at a plurality of positions, the roundness of the inner peripheral surface of the mold can be set with higher accuracy, and the roundness of the tire to be manufactured can be increased to improve the quality.

It is drawing which shows the tire vulcanization molding apparatus of embodiment of this invention. The roundness measuring apparatus of the internal peripheral surface of a metal mold | die is shown, (A) is a front view, (B) is a top view. It is a wave form diagram which shows an example of a measurement result. It is drawing which shows the modification of embodiment of this invention. It is drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tire vulcanization molding apparatus 11, 12 Press 13 Container 14 Upper side plate 15 Lower side plate 16 Tread segment 20 Roundness measuring device 21 of inner peripheral surface of tire vulcanization mold 21 Cylindrical main body 22 Mounting portion 23 Rotation drive Device 24 Encoder 25 Driving means 26 Non-contact displacement measuring instrument 28 Support arm 29 Link 30 Arm 31 Guide shaft 32 Stopper / spacer 33 Battery 36 Wireless transceiver

Claims (7)

The upper side plate, lower side plate, and tread segment of the split mold are assembled in a container that is closed by the press of the tire vulcanization molding device, and the ring is formed in the center of the internal space surrounded by the split mold Set the roundness measuring device of the inner peripheral surface of the mold consisting of the tread segments aligned in the
The roundness measuring device includes a cylindrical main body having a lower end opening, a mounting portion that protrudes from the outer peripheral surface of the lower end of the cylindrical main body and is fitted and held in a fitting portion at a peripheral edge of the central opening of the lower side plate, A tire vulcanizing gold comprising a driving means mounted in a cavity of a cylindrical main body, and a non-contact displacement measuring instrument rotated and moved along the outer peripheral surface of the cylindrical main body by the driving means. A device for measuring the roundness of the inner peripheral surface of a mold.   The drive means includes a rotation drive device and an encoder for detecting a rotation angle connected to the rotation drive device, and the rotation drive device and the encoder are supported by a support arm protruding in a cavity from the cylindrical main body. A link rotatably driven by the rotation drive device is rotatably supported on the upper end of the cylindrical main body, and a guide shaft is vertically suspended from a tip of an arm projecting from the link. The roundness measuring device for the inner peripheral surface of the tire vulcanization mold according to claim 1, wherein a non-contact displacement measuring device is attached.   The tire vulcanization mold according to claim 1 or 2, wherein a battery is provided as a power supply to the rotary drive device and the encoder, and the battery is accommodated in a cavity of the cylindrical body to eliminate external wiring. For measuring the roundness of the inner peripheral surface of   A wireless transceiver is housed in a cavity of the cylindrical main body, and drive control of the driving means is performed wirelessly, and detection data from the non-contact displacement measuring device can be wirelessly transmitted to an external personal computer. The roundness measurement apparatus of the internal peripheral surface of the metal mold | die for tire vulcanization | cure of any one of Claim 3.   The tire vulcanizing gold according to any one of claims 1 to 4, wherein a laser displacement meter is used as the non-contact displacement measuring device, and a motor including a motor with a brake or a servo motor is used as the rotation driving device. A device for measuring the roundness of the inner peripheral surface of a mold.   A stopper / spacer is attached to the non-contact displacement measuring device, the stopper / spacer is fitted to the guide shaft so as to be movable up and down, and the stopper / stopper is magnetically attached by a fixing magnet attached to the guide shaft. The inner circumference of the tire vulcanization mold according to any one of claims 2 to 5, wherein a measurement position by the non-contact displacement measuring device can be arbitrarily set by changing a height position of the magnet for use in the tire. Surface roundness measuring device.   In order to move the non-contact displacement measuring instrument magnetically attached to the guide shaft with a fixing magnet to an arbitrary height position, the arm connected to the guide shaft can also be controlled by the rotary drive device, The roundness measurement of the inner peripheral surface of the tire vulcanization mold according to claim 6, wherein the roundness of the inner peripheral surface of the mold can be measured at a plurality of positions including a crown portion, a shoulder portion, and a middle portion. apparatus.

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