JPH03118410A - Confirming method of bonding part of sheet material - Google Patents

Abstract

PURPOSE:To detect with high accuracy the bonding state of a sheet material by a method whereby ultrasonic waves are projected from an ultrasonic sensor to a bonded part of the sheet material bonded to a molding drum, and by judging the bonding condition of the sheet material through measurement of the distance to the surface of the bonded part. CONSTITUTION:An ultrasonic sensor 3 is placed so that an incident wave and a reflecting wave are found along a bonding part 2a of a sheet material 2, and therefore, detecting errors due to the thickness of the material 2 are reduced. The material 2 cut in a predetermined length is bonded to a molding drum 1. The molding drum 1 is rotated at a constant speed in a direction shown by an arrow, and at the same time, ultrasonic waves of 1mmphi or smaller are irradiated to the surface of the bonding part 2a from the sensor 3. Accordingly, the distance to the surface of the bonding part 2a is measured. In determining the bonding state of the material 1, since the incident wave and reflecting wave from the sensor 3 are found along the bonding part 2a at all times, detecting errors due to the thickness of the material 2 can be eliminated, thereby securing highly accurate detection of the bonding state.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for checking joints of sheet materials,
In more detail, the state of the joint of the sheet material attached to the forming drum, that is, the state in which the ends of the sheet material are polymerized (lap splice), and the state in which the ends of the sheet material are separated (open splice). The present invention relates to a method for checking joints of sheet materials that can automatically and accurately determine the state (normal state) in which splices and end portions are accurately butted together.

[Conventional technology]

Conventionally, in the tire forming process, abnormality detection at the joints of sheet-like materials such as steel belts attached on the forming drum has mostly been carried out by visual inspection by workers.

[Problem that the invention seeks to solve]

However, in recent years, automation in the tire production process,
Highly accurate pasting reduces work, and visual detection by workers cannot improve productivity, and when detection is done visually by workers, it is difficult to always expect accurate detection. There was a problem.

[Purpose of the invention]

This invention was devised by focusing on such conventional problems, and by using an ultrasonic sensor, the bonding state of sheet materials can be automatically detected and determined without human intervention. Therefore, it is an object of the present invention to provide a method for checking joints of sheet-like materials, which can perform highly accurate detection and improve productivity.

[Means to solve the problem]

In order to achieve the above object, this invention disposes an ultrasonic sensor on the forming drum of the sheet-like material, irradiates the joint part of the sheet-like material with ultrasonic waves, and measures the distance to the surface of the joint part. The gist of this method is to detect increases and decreases and determine the bonding state of sheet materials based on this.

[Action of the invention]

This invention is configured as described above, and irradiates ultrasonic waves from an ultrasonic sensor to the joints of the sheet-like materials affixed to the forming drum while rotating the forming drum at a constant speed.
From the amount and increase/decrease of the distance to the joint surface, it is possible to determine the joining state of the sheet-like materials, that is, a state in which the ends of the sheet-like materials are overlapped (lap splice), a state in which the ends of the sheet-like materials are separated (open splice), and a state in which the ends of the sheet-like materials are separated (open It is characterized by automatically and accurately determining the state in which the splice) and end portion are accurately butted together (normal state), making it possible to perform highly accurate detection and improve productivity. There is.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail based on the accompanying drawings.

FIG. 1 shows a perspective view showing the state of implementation of the present invention.
is a forming drum, 2 is a sheet material such as a steel belt attached to the forming drum 1, and 3 is a joint 2 of the sheet material 2.
This ultrasonic sensor 3 is arranged on the forming drum 1 at a predetermined interval and is configured to be rotated by a drive motor 4.

Further, the ultrasonic sensor 3 is connected to the joint portion 2 of the sheet material 2.
It is installed so that the incident wave and the reflected wave are located along the direction a, thereby reducing detection errors due to the thickness of the sheet-like material 2.

Next, a method for checking the bonding state of the sheet-like material 2 will be explained. First, the sheet-like material 2 cut into a predetermined length is attached to the forming drum 1, and the forming drum 1 is rotated at a constant speed in the direction of the arrow. At the same time, 1f is applied from the ultrasonic sensor 3 to the surface of the joint 2a of the sheet-like material 2.
Ultrasonic waves of f[11Φ or less are irradiated, and the distance to the surface of the bonded portion is measured.

That is, during the above measurement, the unevenness of the joint part 2a of the sheet material 2 is detected by the change in the distance between the ultrasonic sensor 3 and the joint surface, and from the moving average value of a certain section during the rotation of the forming drum 1, For example, as shown in the X part of FIG. If there is a large swing to the negative side (-side) as shown in the Y part of Fig. 3, it is determined that the end portion of the sheet material 1 is polymerized (lap splice), and further In the case of O, where there is no reaction, it is determined that the end portions are accurately butted together (butt splice: normal state), and the joint state of the sheet material 1 can be automatically and accurately determined. It can be done.

Further, the above-described bonding state of the sheet-like material 1 is always determined by using an ultrasonic sensor 3 along the bonding portion 2a of the sheet-like material 1.
Since the incident wave and the reflected wave are located at the same location, detection errors due to the thickness of the sheet-like material 2 can be reduced and highly accurate detection and determination can be performed.

〔Effect of the invention〕

This invention irradiates ultrasonic waves from an ultrasonic sensor to the bonded portion of the sheet material pasted on the forming drum as described above while rotating the forming drum at a constant speed, and calculates the distance to the surface of the bonded portion and Since the bonding state of sheet materials is determined by detecting increases and decreases, detection and determination can be performed automatically without human intervention, and therefore highly accurate detection can be performed and productivity can be improved. is possible,
Furthermore, it has the effect of preventing the problem of supplying defective products to the next process.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a state in which the invention is implemented;
FIGS. 2 and 3 are explanatory diagrams showing a method for determining the bonding state of sheet-like materials.

Claims (1)

[Claims] While rotating the forming drum at a constant speed, an ultrasonic sensor irradiates the joint of the sheet material attached to the forming drum with ultrasonic waves, detects the distance and increase/decrease to the surface of the joint, and forms the sheet material. A method for checking joints of sheet-like materials, which comprises determining the joint state of the materials.