JP3936545B2 - Tread segment inner surface unevenness measuring apparatus and measuring method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tread segment inner surface unevenness measuring apparatus and measuring method of a tire vulcanizing mold.
[0002]
[Prior art]
In order to manufacture a tire with good uniformity, a split mold is generally employed as a tire vulcanization mold. As shown in FIG. 9, the split mold f includes an upper side mold a, a lower sand mold b, and a segment mold c divided into a plurality of parts in the radial direction. The segment mold c includes a tread segment d that forms a tread pattern of a tire, and a sector shoe e that holds the tread segment d from the outer surface side.
[0003]
By the way, it is known that the RRO (Radial Runout) of the radial tire and the unevenness amount of the crown inner surface g (the inner surface of the tread segment d) of the split mold f are highly correlated with each other. Careful consideration is essential. Therefore, conventionally, a non-contact sensor i for distance detection that can rotate around the vertical axis and move up and down inside the split mold f at the operating position of the tire press (tire vulcanizer) h to which the split mold f is mounted. And measuring the distance to the crown inner surface g over 360 ° by rotating the non-contact sensor i.
[0004]
[Problems to be solved by the invention]
However, when the unevenness amount of the crown inner surface g is measured in the operating state in which the split mold f is tightened by the tire press h in this way, the component of the container (sector shoe e) and the press platen are not measured for the tread segment d alone. Since the measurement is performed in a state in which the press component due to k distortion or the like is added, when the container is exchanged or moved between the presses, the measurement data is not reproduced and remeasurement is required.
In addition, the adapter ring n of the measuring device j is fitted to the adapter ring fitting part m of the lower side mold b and is centered. This fitting part m is heated at the time of vulcanization and has a diameter that is higher than that at room temperature. Therefore, there is a problem in that the centering of the measuring device j has an error, and the first-order component of the unevenness measured by the error is added eccentrically.
Moreover, since the adapter ring fitting part m is a contact surface of the bead ring which chucks the bladder and takes out the tire in every vulcanization operation, the surface of the fitting part m actually used for operation is rough. It was difficult to fit tightly with the adapter ring n of the measuring device j, and there was difficulty in using the centering of the measuring device j.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a tread segment inner surface unevenness measuring apparatus and measuring method in which a centering error is greatly reduced and measurement can be performed with high accuracy.
[0006]
[Means for Solving the Problems]
In order to achieve the above-described object, the tread segment inner surface unevenness measuring apparatus according to the present invention is a mounting for holding a tread segment of a tire vulcanizing mold on the basis of an outer peripheral surface aligned in a cylindrical shape equivalent to an operating state. The tread segment holder includes a ring portion and a bottom portion that are continuously provided in an integrated manner, and the inner surface unevenness of the cylindrically aligned tread segment that is held on the inner peripheral surface of the mounting ring portion of the tread segment holder is determined. Measuring means for measuring is attached to the central portion of the bottom of the tread segment holder via a positioning and holding means in a detachable manner.
[0007]
The tire vulcanization mold tread segment includes a tread segment holding body in which a mounting ring portion for holding a tread segment aligned in a cylindrical shape equivalent to an operating state as a reference and a bottom portion are integrally provided. And a rotating shaft that is detachably attached to the center of the bottom of the tread segment holder through a positioning and holding means, and a mounting ring portion of the tread segment holder that is vertically movable on the rotating shaft. A non-contact sensor for measuring the distance to the inner surface of the cylindrically aligned tread segment held on the inner peripheral surface of the encoder, and further, an analog electrical signal output from the non-contact sensor is used as an encoder rotation pulse. Data storage operation means for performing A / D conversion and storing and calculating each time is provided.
[0008]
The tread segment inner surface unevenness measuring method according to the present invention includes a tire vulcanization mold tread segment aligned in a cylindrical shape equivalent to an operating state, and a mounting ring portion of a bottomed cylindrical tread segment holder Is measured on the inner circumferential surface of the cylindrical tread segment by measuring means attached to the center of the bottom of the tread segment holder.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
[0010]
FIG. 1 is a cross-sectional front view showing an embodiment of a tread segment inner surface unevenness measuring apparatus according to the present invention. As shown in FIGS. 1 to 3, this measuring apparatus includes a bottomed cylindrical tread segment holder 1 in which a mounting ring portion 2 and a bottom portion 3 are integrally connected, and a bottom portion 3 of the tread segment holder 1. Measuring means 4 installed at the center part (axial center P position), positioning holding means 6 for detachably holding the measuring means 4 at the center part of the bottom part 3, and data storage arithmetic means 5 are provided. .
[0011]
More specifically, the mounting ring portion 2 of the tread segment holder 1 holds the tread segments 7 of the tire vulcanizing mold with reference to the outer peripheral surface 8 aligned in a cylindrical shape equivalent to the operating state. Thus, the cylindrically aligned tread segments 7 are held on the inner peripheral surface 9 of the mounting ring portion 2. A circular bottom 3 is connected to the lower end of the mounting ring 2 in an integrated manner, for example, by welding or bolt / nut coupling.
[0012]
The measuring means 4 measures the amount of irregularities on the inner surface 10 of the cylindrically aligned tread segments 7 held in the inner peripheral surface 9 of the mounting ring portion 2 of the tread segment holder 1 (state shown in FIG. 1). The rotary shaft 11 is vertically attached to the central portion (axial center P) of the bottom portion 3 of the tread segment holder 1 so as to be detachable, and the inner peripheral surface of the mounting ring portion 2 is provided on the rotary shaft 11 so as to be vertically movable. 9 and a non-contact sensor 12 that measures the distance to the inner surface 10 of the cylindrically aligned tread segments 7.
[0013]
The rotary shaft 11 includes a center fixed shaft portion 13 and a cylindrical outer rotary shaft portion 15 that is externally fitted to the center fixed shaft portion 13 via bearings 14... The part 15 is rotatable relative to the part 15. The lower end 13a of the center fixed shaft portion 13 is projected from the outer rotating shaft portion 15 and is held by positioning and holding means 6 described later. In addition, upper and lower two-stage casings 16 and 17 are attached to the upper end of the outer rotating shaft portion 15, and an encoder 18 is provided inside the upper casing 16, and the shaft portion of the encoder 18 is connected to the center fixed shaft portion 13. It is connected to the upper end 13b.
[0014]
A guide rail 19 is attached to the outer surface of the outer rotary shaft portion 15 in the axial direction, and a slide block 20 that can slide up and down along the guide rail 19 is provided. A support arm 21 having a predetermined length is attached to the slide block 20 so as to protrude in the radial direction, and the non-contact sensor 12 is provided at the tip of the support arm 21. Further, a balancer 22 for applying a tensile force is attached to the lower surface of the plate attached to the upper surface of the casing 16 so that the lower end of the wire 23 is connected to the slide block 20, and a handle 24 is attached to the upper surface of the plate. Thus, the outer rotary shaft portion 15 of the rotary shaft 11 can be manually rotated around the axis P.
[0015]
By the way, reference numeral 25 denotes auxiliary measuring means attached to the upper edge of the mounting ring portion 2 of the tread segment holder 1. As this auxiliary measuring means 25, for example, a fixing portion 25a fixed to the upper edge of the mounting ring portion 2 is used. And a digital scale unit that includes a slide collar 25b that is slidable with respect to the fixed part 25a and that can measure the moving distance of the slide collar 25b. This auxiliary measuring means 25 is provided for measuring the distance from the rotating shaft 11 to the vicinity of the inner surface 10 of the tread segment 7. In other words, the non-contact sensor (laser displacement meter head) 12 detects the distance to the irradiated object by receiving the reflected laser beam irradiated to the irradiated object, but its measurable range is as small as less than 100 mm. Therefore, although the distance to the crown part (inner surface 10) of the tread segment 7 can be measured, the absolute diameter of the crown part cannot be measured. Therefore, auxiliary measurement means 25 is provided to assist in absolute diameter measurement. Further, the length of the support arm 21 is set so that the distance to the crown portion can be measured by the non-contact sensor 12.
[0016]
As shown in FIGS. 1 and 2, the positioning holding means 6 includes a positioning block 26 placed in the vicinity of the axis P of the bottom 3 of the tread segment holder 1 and the position of the positioning block 26 in plan view 2. A nut member fixed to the upper surface of the bottom portion 3 and screwed to the first adjustment bolt 27 for adjusting the block from the direction, the second adjustment bolt 28, and the first and second adjustment bolts 27, 28. 29, and a pressing bolt 30 that presses the lower end 13a of the center fixed shaft portion 13 of the rotating shaft 11 toward the positioning block 26, a nut member 31 that is screwed to the pressing bolt 30 and is fixed to the upper surface of the bottom portion 3, It has.
[0017]
More specifically, the positioning block 26 is formed by notching one outer side surface 34a of the rectangular flat block body to form a trapezoidal concave portion 32 in a plan view, and the concave portion 32 includes a lower end 13a of the center fixed shaft portion 13. A pair of gradient surfaces 33, 33 that can come into contact with the outer peripheral surface of the two points. The pair of gradient surfaces 33 and 33 are set to contact the outer peripheral surface of the lower end 13a of the center fixed shaft portion 13 at a center angle θ of 90 °, for example. Further, the first fixing bolts 27 for fixing the block are arranged so as to abut at right angles to the outer side surface 34a on the side where the recess 32 is formed and the outer side surface 34b on the opposite side, and the second adjusting bolts 28, 28 is disposed so as to abut on the remaining two surfaces (outer surfaces 35a, 35b) of the positioning block 26 at right angles.
[0018]
According to this positioning and holding means 6, the first nut from each nut member 31 in a state where the axis of the rotating shaft 11 of the measuring means 4 is aligned with the central portion (axial center P) of the tread segment holder 1. The projecting dimensions of the second adjusting bolts 27, 28,... Are adjusted so that the inclined surfaces 33, 33 of the concave portion 32 of the positioning block 26 are brought into contact with the lower end 13a of the center fixed shaft portion 13 By pressing 13a, the rotating shaft 11 is held vertically on the upper surface of the bottom portion 3, and the center fixing shaft portion 13 is fixed. In this way, if the positioning block 26 is fixed at the centering set position, the centering can be easily and accurately reproduced even when the rotary shaft 11 is removed by loosening the pressing bolt 30 and the rotary shaft 11 is attached again. .
[0019]
As shown in FIG. 3, the data storage calculation means 5 includes a laser displacement meter amplifier 36 connected to a non-contact sensor (laser displacement meter head) 12 of the measurement means 4, and a laser displacement meter amplifier 36 and an encoder. A / D converter 37 connected to 18, an auxiliary measurement means amplifier 38 connected to auxiliary measurement means 25, and a waveform analyzer (personal computer) 39 connected to the amplifier 38 and A / D converter 37. And.
[0020]
Next, an example of a measuring method using the tread segment inner surface unevenness measuring apparatus will be described. As shown in FIG. 1, first, a pair of tread segments 7 are aligned and attached to the inner peripheral surface 9 of the attachment ring portion 2 of the tread segment holder 1 in the same cylindrical shape as in the operating state. . Further, the rotating shaft 11 of the measuring means 4 is set to the center portion (on the axis P) of the holding body 1 by the positioning holding means 6 (as explained in FIG. 2), and the auxiliary measuring means 25 is attached. Set in the ring part 2. The positioning block 26 is fixed in advance at the centering set position. Further, the data storage operation means 5 is set (as shown in FIG. 3).
[0021]
When the measurement preparation is completed in this way, as shown in FIG. 4, first, the slide flange 25b of the auxiliary measuring means 25 is slid to the axis P side, and the tip end surface 40 is moved to the measurement reference plane of the rotary shaft 11. The value of the auxiliary measuring means 25 is reset to 0 at this time. In the present embodiment, the measurement reference surface 41 is the radially outer surface of the guide rail 19. The distance L ₁ from the axis P of the rotating shaft 11 to the measurement reference plane 41 is known in advance because it is a reference machine dimension.
[0022]
Next, as shown in FIG. 5, the tip of the slide collar 25b of the auxiliary measuring means 25 is retracted to the vicinity of the inner surface 10 of the tread segment 7, so that the slide collar 25b is separated from the measurement reference surface 41 of the rotary shaft 11. The distance L ₂ to the tip surface 40 is measured. Thereafter, the non-contact sensor 12 is raised manually, to measure the distance L ₃ of in a non-contact sensor 12 to the slide rod portion 25b. Then, as shown in FIG. 6, the non-contact sensor 12 is lowered to the measurement position, and the distance L ₄ to the inner surface 10 of the tread segment 7 is measured by the non-contact sensor 12. Thus, by measuring the respective distances _{L 1, L 2, L 3} , L 4, the absolute diameter (radius) measurements of the inner surface 10 of the tread segments 7 can be determined by the _{L 4 -L 3 + L 2 +} L 1 it can. At this time, the distances L ₃ and L ₄ are within the measurable range of the non-contact sensor 12. Then, the outer rotating shaft portion 15 of the rotating shaft 11 is rotated while measuring the distance L ₄ to the inner surface 10 of the cylindrically aligned tread segments 7 held by the tread segment holding body 1, and the tread segments 7. The inner surface is measured over one rotation (360 °).
[0023]
The operation status of the data storage calculation means 5 at this time will be described with reference to FIGS. 3 to 6. The measurement data (distance L ₂ ) output from the auxiliary measurement means 25 is input to the waveform analyzer 39 via the amplifier 38. And memorized. Further, measurement data (distance L ₃ ) is output from the non-contact sensor 12 as an analog electric signal, amplified by the laser displacement meter amplifier 36, and input to the A / D converter 37 for A / D conversion, The waveform is input and stored in the waveform analyzer 39. Thereafter, measurement data (distance L ₄ ) is output as an analog electric signal from the non-contact sensor 12 and amplified by the laser displacement meter amplifier 36, and the analog electric signal is generated for each pulse of the encoder 18 generated along with the rotational displacement. A / D conversion is performed by the A / D converter 37, and measurement data (distance L ₄ ) for one rotation is input and stored by the waveform analyzer 39. The data of the distance L ₁ may be input to the waveform analyzer 39 in advance.
[0024]
Thereafter, the data for one rotation stored in the waveform analyzer 39 is subjected to arithmetic processing (Fourier series analysis), so that the raw waveform D for one rotation is displayed on the screen of the waveform analyzer 39 as shown in FIG. A primary waveform A, a secondary waveform B, a combined waveform C of 1 to 20th order obtained by Fourier analysis of the raw waveform D for one rotation are displayed, and the amplitude value and peak position of each order component And the average diameter and the like are numerically displayed (not shown), and the amount of unevenness can be specified on the circumference. That is, the RRO measurement result of the tread segment 7 can be displayed. The height position of the non-contact sensor 12 is changed, and the measurement height position of the tread segment 7 is changed (similar to the above) to measure the inner surface unevenness amount.
[0025]
By the way, in this invention, it is comprised so that an internal surface unevenness | corrugation measurement is possible about the tread segment of various sizes. That is, as shown in FIG. 7, a plurality of tread segment holders 1... Corresponding to various sizes of the tread segments 7 are provided, and positioning holding means 6 are provided on the bottom 3 of each tread segment holder 1. FIG. 7 illustrates the usage state of the tread segment holder 1 corresponding to the small tread segments 7. At this time, the positioning and holding means 6 has the same shape and dimension irrespective of the size of the holding body 1 so that the measuring means 4 can be shared. However, the support arm 21 of the measuring means 4 needs to be replaced depending on the size of the tread segment 7, and a plurality of support arms 21 having different length dimensions are prepared in advance. The auxiliary measuring means 25 and the data storage calculating means 5 (see FIG. 3) are also shared.
[0026]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0027]
(According to claim 1 or 2) By the tread segment holder 1, the tread segments 7 are aligned and held in a cylindrical shape equivalent to the operating state, and the inner surface unevenness of the cylindrical tread segments 7 is set. Can be measured. In other words, in the past, a device that measures the unevenness of the crown portion in an operating state in which the entire split mold is tightened by a tire press (tire vulcanizer) is used, so the measurement result obtained by adding the container component and the press component is However, in the present invention, it is possible to measure the unevenness by holding the tread segments 7 in a state where neither the container component nor the press component is added, so that an effective and accurate measurement result of the segment alone can be obtained. it can.
[0028]
Further, since the measuring and holding means 6 is positioned (stopped) and held by the positioning and holding means 6 and is centered, there is no fitting error caused by the centering structure due to fitting, and the centering error is greatly reduced. Can do. Therefore, the primary component of the unevenness of the inner surface of the tread segment 7 that is the measurement result can be detected with high accuracy.
[0029]
(According to claim 2) The inner surface unevenness measurement can be efficiently performed by the non-contact sensor 12 of the measuring means 4. Also, the inner surface unevenness measurement data from the measuring means 4 can be subjected to Fourier series analysis by the data storage arithmetic means 5 to obtain the RRO measurement result of the tread segment 7.
[0030]
(According to claim 3) Since the tread segments 7 are aligned and held in a cylindrical shape equivalent to the operating state in which the container component and the press component are not added, and the amount of inner surface unevenness is measured, Accurate measurement results can be obtained. That is, the conventional method is a method of measuring the unevenness of the crown portion in an operating state in which the entire split mold is tightened by a tire press, and thus the measurement result is obtained by adding the container component and the press component. Trouble is solved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional front view showing an embodiment of a tread segment inner surface unevenness measuring apparatus according to the present invention.
FIG. 2 is a cross-sectional plan view of an essential part showing centering of a rotating shaft by positioning and holding means.
FIG. 3 is a block diagram showing a configuration of data storage operation means.
FIG. 4 is a first operation explanatory view showing an inner surface unevenness measurement state.
FIG. 5 is a second operation explanatory view showing an inner surface unevenness measurement state;
FIG. 6 is a third action explanatory view showing an inner surface unevenness measurement state.
FIG. 7 is an explanatory view showing a state in which a measuring means is shared for tread segment holders of different sizes.
FIG. 8 is a waveform diagram showing an example of a measurement result.
FIG. 9 is a cross-sectional view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tread segment holding body 2 Mounting ring part 3 Bottom part 4 Measuring means 5 Data storage calculating means 6 Positioning holding means 7 Tread segment 8 Outer peripheral surface 9 Inner peripheral surface
10 Inside
11 Rotation axis
12 Non-contact sensor
18 Encoder

Claims (3)

A tread segment holder in which a mounting ring portion 2 for holding a tread segment 7 of a tire vulcanizing mold in a cylindrical shape equivalent to an operating state is held as a reference, and a bottom portion 3 are integrally connected. A tread segment holding means for measuring the inner surface unevenness of the cylindrically aligned tread segments 7 held on the inner peripheral surface 9 of the mounting ring portion 2 of the tread segment holding body 1. A tread segment inner surface unevenness measuring apparatus, wherein the tread segment inner surface unevenness measuring apparatus is detachably attached to a central portion of the bottom portion 3 of the body 1 through positioning holding means 6. A tread segment holder in which a mounting ring portion 2 for holding a tread segment 7 of a tire vulcanizing mold in a cylindrical shape equivalent to an operating state is held as a reference, and a bottom portion 3 are integrally connected. A rotary shaft 11 that is provided with a body 1 and that is vertically attached to a central portion of the bottom portion 3 of the tread segment holder 1 via a positioning holding means 6 and that can be moved up and down on the rotary shaft 11. And a non-contact sensor 12 that measures the distance to the inner surface 10 of the cylindrically aligned tread segments 7 held on the inner peripheral surface 9 of the mounting ring portion 2 of the tread segment holder 1. Further, the present invention further comprises data storage calculation means 5 for storing and calculating the analog electric signal output from the non-contact sensor 12 by performing A / D conversion for each rotation pulse of the encoder 18. Inner surface irregularities measuring apparatus of the tread segments. The tread segments 7 of the tire vulcanization mold are aligned in the same cylindrical shape as that in the operating state, and held on the inner peripheral surface 9 of the mounting ring portion 2 of the bottomed cylindrical tread segment holder 1. A tread segment inner surface unevenness measuring method, characterized in that the inner surface unevenness of the cylindrically aligned tread segments 7 is measured by a measuring means 4 attached to the center of the bottom 3 of the tread segment holder 1.

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