JP6424130B2 - Sidewall material cutting method and apparatus - Google Patents

Description

  The present invention relates to a sidewall material cutting method and a cutting apparatus for cutting a sidewall material into a predetermined length in manufacturing a tire.

  In the production of a pneumatic tire, an inner liner or a carcass ply is wound around a molding drum, and a rubber member such as a tread material or a sidewall material is wound on the drum, and the ends of the rubber member are joined together. Form a cover.

  And among the rubber members, particularly for the sidewall members, the tire performance is taken into consideration, and the end portions are usually cut using an ultrasonic cutter so that a cut end surface inclined with respect to the bottom surface is formed. Are jointed (for example, Patent Documents 1 to 3).

JP 10-217193 A JP 2012-30437 A JP 2013-159083 A

  However, in recent years, there has been an increasing demand for improvement in productivity, and further improvements have been required for the above-described sidewall material cutting technology.

  Then, this invention makes it a subject to provide the cutting technique of the sidewall material which can improve productivity rather than before.

  The inventor has intensively studied and found that the above-described problems can be solved by the invention described below, and has completed the present invention.

The invention described in claim 1
A method for cutting a side wall material, in which a strip-shaped side wall material is cut using an ultrasonic cutter at a predetermined cut angle inclined in the thickness direction,
A delivery step of delivering the sidewall material by a sidewall servicer;
A measuring step of measuring the thickness of the delivered sidewall material with a laser displacement meter;
Based on the measured thickness of the sidewall material and the cut angle, a calculation step of calculating the length of the cut surface from the cut start position on the upper surface of the sidewall material to the cut end position on the lower surface,
Based on the calculated length of the cut surface, a leading edge step of leading the tip of the cutter blade of the ultrasonic cutter to a predetermined position;
A cutting step of cutting the sidewall material by moving from the predetermined position to the cutting end position via the cutting start position while vibrating the cutter blade that is tipped out. This is a characteristic method for cutting a sidewall material.

The invention described in claim 2
A side wall material cutting device that cuts a strip-shaped side wall material with an ultrasonic cutter at a predetermined cut angle inclined in the thickness direction,
A delivery means for delivering the sidewall material by a sidewall servicer;
Measuring means for measuring the thickness of the delivered sidewall material with a laser displacement meter;
Based on the measured thickness of the sidewall material and the cut angle, calculating means for calculating the length of the cut surface from the cut start position on the upper surface of the sidewall material to the cut end position on the lower surface,
Based on the calculated length of the cut surface, a tip-out means for tip-out the cutting edge of the ultrasonic cutter to a predetermined position;
A cutting means for cutting the sidewall material by moving from the predetermined position to the cutting end position via the cutting start position while vibrating the cutter blade that is tipped out. It is a cutting apparatus for the sidewall material that is characterized.

  ADVANTAGE OF THE INVENTION According to this invention, the cutting technique of the side wall material which can improve productivity rather than before can be provided.

It is a side view which shows typically the structure of the cutting device of the sidewall material which concerns on one embodiment of this invention, and the method of tipping out a cutter blade. It is a side view which shows the fundamental structure of the cutting apparatus of the side wall material which concerns on one embodiment of this invention. It is a side view which shows typically the method of the front-end | tip protrusion of the cutter blade in the conventional cutting method of sidewall material.

  Hereinafter, the present invention will be described based on embodiments.

1. Sidewall Material Cutting Device First, a side wall material cutting device (hereinafter also simply referred to as “cutting device”) according to an embodiment of the present invention will be described. FIG. 1 is a side view schematically showing a configuration of a cutting device and a method of leading the cutter blade according to the present embodiment. FIG. 2 is a side view showing a basic configuration of the cutting device according to the present embodiment.

  As shown in FIGS. 1 and 2, in the cutting device according to the present embodiment, the thickness d of the sidewall material W is measured on the upstream side of the sidewall servicer 3 (delivery means) that delivers the sidewall material W. A laser displacement meter 9 (measuring means) is provided.

  The ultrasonic cutter 2 is provided with a leading-out means (not shown) for leading the cutter blade 2a of the ultrasonic cutter 2 to a predetermined position toward the sidewall material W at a predetermined inclination angle (cut angle). ing.

  Furthermore, the cutting device 1 according to the present embodiment is provided with a calculation unit (not shown), and the side wall material is determined based on the thickness d of the side wall material W measured by the laser displacement meter 9 and the cut angle. The length of the cut surface from the cut start position on the upper surface to the cut end position on the lower surface is calculated. 4a and 4b are pressing rollers, 5 is an anvil, 6 is a forming drum, and 7 is a support member.

2. Next, a method for cutting the sidewall material according to the present embodiment (hereinafter, also simply referred to as “cutting method”) will be described. The cutting method according to the present embodiment is a method of cutting the sidewall material using the cutting device.

  The cutting method according to the present embodiment includes a feeding process, a measuring process, a calculating process, a leading-out process, and a cutting process.

(1) Sending-out process First, in the sending-out process, the strip-shaped sidewall material W is sent out by the sidewall servicer 3.

(2) Measurement Step Next, in the measurement step, the thickness d of the sent sidewall material W is measured by the laser displacement meter 9.

(3) Calculation Step Next, in the calculation step, the cut from the cut start position on the upper surface of the sidewall material W to the cut end position on the lower surface based on the measured thickness d of the sidewall material W and the cut angle θ. The length X of the surface is calculated.

(4) Leading-out process Next, in the leading-out process, based on the calculated cut surface length X, the cutting edge of the cutter blade 2a of the ultrasonic cutter 2 is cut to a predetermined position (cut from the cut end position on the lower surface). The tip is brought out (to the position of the operating distance X2). Thus, the preparation before the start of cutting is completed, and thereafter the cutting of the sidewall material W is started.

  The cutting method according to the present embodiment is greatly different from the conventional cutting method in that this tip-out process is provided. That is, in the conventional cutting method, the length of the cut surface is not calculated for each side wall material, and the length of the cut surface that is usually about 20 to 25 mm is as shown in FIG. The cutting operation was performed by fixing the cutting operation distance X1 to about 40 mm so as to maintain a sufficient margin against changes in the thickness d of the sidewall material W and the cutting angle θ.

  In this way, in the conventional cutting method, even when the sidewall material is thin or when the cutting angle is large and the cutting length is short, the cutting position is fixed over the same distance by fixing the tip position of the cutter blade. As a result, it took extra time to cut the sidewall material.

  On the other hand, as described above, the cutting method according to the present embodiment efficiently sets the cutting operation distance X2 based on the thickness d of the sidewall material W and the cutting angle θ as shown in FIG. Therefore, the cutting operation time can be shortened and productivity can be preferably improved.

(5) Cutting process Next, in the cutting process, the cutter blade 2a is vibrated by operating the ultrasonic vibrator of the ultrasonic cutter 2, and the cutting is performed from the position where the tip is put out via the cutting start position. The cutter blade 2a is moved to the end position (the range indicated by the length X in FIG. 1), and the sidewall material W is cut.

  At this time, as described above, the cutter blade 2a of the ultrasonic cutter 2 has been advanced to the optimum position in advance according to the thickness d and the cut angle θ of the sidewall material, and thus is sufficiently separated from the sidewall material W. Compared with a conventional cutting method in which a cutting operation is performed from a fixed position, the cutting operation time can be shortened, and productivity can be improved.

  After the cut is completed, the cutter blade 2a of the ultrasonic cutter 2 is returned to the original standby position to prepare for the next cut.

3. Cutter blade tip-out method As described above, the feature of the present embodiment is that the cutter blade 2a is tipped out in advance to an optimum position according to the thickness d of the sidewall material and the cut angle θ. Therefore, the method of leading the cutter blade 2a will be described in more detail below.

  First, when the inclination angle adjusting device 8 (see FIG. 2) is used to adjust the angle of the inclined surface on which the cutter blade 2a of the ultrasonic cutter 2 is slid to the cut angle θ of the cut surface, and the cutter blade 2a is slid. The horizontal position of the slope (the position in the left-right direction in the figure) is adjusted so that the cutter blade 2a is pushed into the sidewall material W along the cut surface.

Next, the tip of the cutter blade 2a is advanced from the standby position to a predetermined position. Specifically, first, the length X of the cut surface is calculated based on the following equation from the thickness d of the sidewall material W and the cut angle θ of the cut surface. The cut angle θ is normally set to about 15 °.
X = d / sin θ

Next, the cut operation distance X2 is calculated from the calculated cut surface length X based on the following equation. In the following formula, the constant k is normally set to about 1.1 in consideration of safety so that the cutter blade 2a does not come into contact with the sidewall material W. This is the distance between the blade 2a and the cut start position of the sidewall material W.
X2 = kX

  At this time, the length X of the cut surface is generally about 20 to 25 mm as described above, but varies depending on the thickness d of the sidewall material W and the cut angle θ. Specifically, the cut surface length X increases as the thickness d of the sidewall material W increases, and the cut surface length X increases as the cut angle θ decreases. In the present embodiment, as described above, the cutting operation distance X2 is set to the optimum length as shown in FIG. 1 based on the thickness d of the sidewall material W and the cutting angle θ. The cutting operation time can be shortened, and the productivity can be preferably improved.

  In the present embodiment, since the thickness d of the sidewall material W is measured by the laser displacement meter 9, even if the sidewall material W is changed, the operator can input each numerical value. Therefore, workability can be improved.

  Next, the present invention will be described more specifically with reference to examples.

1. Cut target thickness d, cut angle θ, and cutter blade operation (movement) speed (Example, Comparative Example)
A sidewall material W having a thickness d = 6 mm was cut at an inclination angle θ = 15 ° of the cut surface. Moreover, the operation speed of the cutter blade 2a at this time was made constant at 7 mm / sec.

2. Cutting edge of cutter blade (Example)
The length X of the cut surface was calculated from the thickness d and the inclination angle θ, the cutting operation distance X2 was calculated by multiplying the length X of the cut surface by a constant k, and the tip of the cutter blade 2a was put out. The constant k was 1.1.
X2 = 6 / sin15 ° × 1.1 = 25.5 mm
(Sin15 ° = 0.2588)

(Comparative example)
The tip of the cutter blade 2a was put out by setting the cutting operation distance to X1 = 40 mm.

3. Comparison of cutting operation time The cutting operation time in Examples and Comparative Examples is as follows.
Cutting operation time of the embodiment = 25.5 mm / 7 mm / sec≈3.6 sec
Cut operation time of comparative example = 40 mm / 7 mm / sec≈5.7 sec

  From this result, it was found that the cutting operation time was shortened by about 2.1 sec and the cutting operation time could be shortened by about 38% in the example, and the productivity could be improved.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above-described embodiment within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 1 Cutting device 2 Ultrasonic cutter 2a Cutter blade 3 Side wall servicer 4a, 4b Press roller 5 Anvil 6 Molding drum 7 Support member 8 Inclination angle adjustment device 9 Laser displacement meter d Thickness θ Cut angle W Side wall material X Length of cut surface X1, X2 Cut operation distance

Claims (2)

A method for cutting a side wall material, in which a strip-shaped side wall material is cut using an ultrasonic cutter at a predetermined cut angle inclined in the thickness direction,
A delivery step of delivering the sidewall material by a sidewall servicer;
A measuring step of measuring the thickness of the delivered sidewall material with a laser displacement meter;
Based on the measured thickness of the sidewall material and the cut angle, a calculation step of calculating the length of the cut surface from the cut start position on the upper surface of the sidewall material to the cut end position on the lower surface,
Based on the calculated length of the cut surface, a leading edge step of leading the tip of the cutter blade of the ultrasonic cutter to a predetermined position;
A cutting step of cutting the sidewall material by moving from the predetermined position to the cutting end position via the cutting start position while vibrating the cutter blade that is tipped out. A method for cutting a sidewall material. A side wall material cutting device that cuts a strip-shaped side wall material with an ultrasonic cutter at a predetermined cut angle inclined in the thickness direction,
A delivery means for delivering the sidewall material by a sidewall servicer;
Measuring means for measuring the thickness of the delivered sidewall material with a laser displacement meter;
Based on the measured thickness of the sidewall material and the cut angle, calculating means for calculating the length of the cut surface from the cut start position on the upper surface of the sidewall material to the cut end position on the lower surface,
Based on the calculated length of the cut surface, a tip-out means for tip-out the cutting edge of the ultrasonic cutter to a predetermined position;
A cutting means for cutting the sidewall material by moving from the predetermined position to the cutting end position via the cutting start position while vibrating the cutter blade that is tipped out. Characteristic side wall material cutting device.

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