JP2000292136A - Bend inspecting method of molded object of continuous length and inspecting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable automatic inspection of bend of a molded object of continuous length, on a molding line, without needing manhour and cost. SOLUTION: This inspecting apparatus is equipped with a retainer 2 performing positioning in the state that the bottom surface of a molded object 1 of continuous length is in contact with a bottom plate part 2a, and a side surface is in contact with a side plate part 2b, vertical direction light detecting sensors 3 arranged in three portions of upper positions of both ends and a central part along the longitudinal direction X of the molded object 1 positioned on the retainer 2 which are isolated from the side plate part 2b by specified distances in the horizontal direction Y, horizontal direction light detecting sensor 4 arranged in three portions of side positions of both ends and the central part along the longitudinal direction X of the molded object 1 position on the retainer 2 which are isolated from the bottom plate part 2a by specified distances in the vertical direction Z, and an acceptability judging part 5 judging acceptability of bend, on the basis of signals from the light detecting sensors 3, 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for inspecting bending of a long molded product (particularly, an extruded product) for inspecting a bending defect.

[0002]

2. Description of the Related Art Conventionally, there has been proposed an apparatus for automatically measuring the external dimensions of a long molded product such as a tubular body (see, for example, Japanese Patent Application Laid-Open No. 46-7792).

[0003] On the other hand, in the measurement of the amount of bending of a long molded product such as a rain gutter, conventionally, after removing the molded product from a molding line, the molded product is fixed to a horizontal plate such as a surface plate. It is performed by a manual method such as measuring a gap between a molded product and a surface plate with a right angle ruler or the like.

[0004] For example, as to the bending in the horizontal direction of a long molded product such as a rain gutter, as shown in FIGS. 7 (a) and 7 (b), a thread 92 is inserted between the corners at both ends of the molded product 91. The side surface 91a of the molded article 91 is attached to a vertical plate 93 by a method of measuring the gap between the thread 92 and the molded article 91 with a ruler, or as shown in FIGS. A method of contacting and measuring the gap between the horizontal plate 93 and the side surface 91a of the molded product 91 with a ruler at both ends and the center has been used.

FIG. 7 shows the vertical bending.
As shown in (e) and (f), the molded article 91 is placed on the horizontal plate 93, and the horizontal plate 9 is placed at both ends and the center.
A method of measuring the gap between the molding 3 and the molded product 91 with a ruler is used.

[0006]

However, if the inspection of the amount of bending of the molded article is performed by the above-mentioned manual sampling inspection, if a defect occurs, if a defect occurs, the inspection is performed from the previous inspection time to the current inspection time. Since there is a possibility that all of the molded products are defective, it is necessary to lot-out all the molded products and inspect all the molded products again. Therefore, there is a problem that a large number of man-hours are required for re-inspection.

[0007] Further, in the case of extrusion molding, the bending failure of the molded article tends to occur continuously, and there has been a problem that the material cost of the molded article produced during that time is wasted.

The present invention has been made in order to solve such a problem, and an object of the present invention is to automatically inspect the bending of a long molded product on a molding line without increasing man-hours and costs. It is an object of the present invention to provide a method and an apparatus for inspecting the bending of a long molded product which can be inspected in a flexible manner.

[0009]

Means for Solving the Problems To solve the above problems, a method for inspecting the bending of a long molded product according to the present invention comprises:
Placed on a support consisting of a bottom plate portion and a side plate portion rising vertically from one side edge of the bottom plate portion with the bottom surface of the elongated molded product in contact with the bottom plate portion and one side surface in contact with the side plate portion Then, it is measured whether there is a certain gap or more between the side plate part and the three places at both ends and the center part of one side surface of the long molded product, and there is even one gap that is more than a certain gap. It is determined that there is no horizontal bending defect, and whether there is a certain gap or more between the bottom plate part and the three places at both ends and the center part of the bottom of the long molded product, In the case where there is even one gap, the bending in the vertical direction is determined to be defective.

That is, when the elongated molded product has a bending defect in the horizontal direction, and when both ends of the elongated molded product are in contact with the side plate portion, the central portion is separated from the side plate portion by a predetermined distance or more. That is, when the central portion of the elongated molded product is in contact with the side plate portion, one or both of the both end portions are separated from the side plate portion by a certain distance or more. As a result, a horizontal bending defect can be detected.

Similarly, when the elongated molded product has a bending defect in the vertical direction, and when both end portions of the elongated molded product are in contact with the bottom plate portion, the central portion has a predetermined distance from the bottom plate portion. If the central part of the elongated molded article is in contact with the bottom plate, one or both of the both ends are separated from the bottom plate by a certain distance or more. This allows
Bending defects in the vertical direction can be detected.

The present invention also relates to a device for inspecting the bending of a long molded product, which is a device for inspecting the bending of a long molded product in the longitudinal direction. A support consisting of a standing side plate portion, a bottom surface of the long molded product is brought into contact with the bottom plate portion, and a positioner is positioned in a state where one side surface of the long molded product is brought into contact with the side plate portion, and positioning on this support member The upper part is located at a predetermined distance in the horizontal direction from the side plate part at three positions above both ends and the center part along the longitudinal direction of the formed elongated molded product, and is parallel to the side plate part. And a vertical light detection sensor arranged to irradiate a light beam in the vertical direction, and three of the lateral positions of both ends and a central portion along the longitudinal direction of the elongated molded product positioned on the support. A predetermined distance from the bottom plate in the vertical direction. A horizontal light detection sensor that is placed at a distance only and radiates a light beam parallel to the bottom plate and in the horizontal direction, and judges the quality of the bend based on signals from these light detection sensors And a pass / fail determination unit. Further, the vertical direction light detection sensor and the horizontal direction light detection sensor are constituted by transmission type photoelectric tubes.

That is, when the elongated molded product has a bending defect in the horizontal direction, and when both ends of the elongated molded product are in contact with the side plate portion, the central portion is separated from the side plate portion by a predetermined distance or more. Will be. As a result, when the vertical light detection sensor is a transmission type photoelectric tube, the signal of the vertical light detection sensor at both ends is turned off, and the signal of the vertical light detection sensor at the center is turned on. In addition, when the central portion of the elongated molded product is in contact with the side plate portion, one or both of the end portions is separated from the side plate portion by a certain distance or more. As a result, the signal of the vertical light detection sensor at one end or both ends is turned on, and the signal of the vertical light detection sensor at the center is turned off. That is, in any case, the signal of at least one vertical direction light detection sensor is turned on. Therefore, by determining the state of this signal by the pass / fail judgment unit, it is possible to detect a horizontal bending defect.

Similarly, when the elongated molded product has a bending defect in the vertical direction, and when both end portions of the elongated molded product are in contact with the bottom plate portion, the central portion has a predetermined distance from the bottom plate portion. You will be more than a distance away. As a result, when the horizontal light detection sensor is a transmissive photoelectric tube, the signals of the horizontal light detection sensors at both ends are turned off, and the signal of the horizontal light detection sensor at the center is turned on. When the central part of the long molded product is in contact with the bottom plate, one or both of the ends are separated from the bottom plate by a certain distance or more. As a result, the signal of the horizontal light detection sensor at one end or both ends is turned on, and the signal of the horizontal light detection sensor at the center is turned off. That is, in any case, the signal of at least one horizontal direction light detection sensor is turned on. Therefore, by determining the state of this signal by the pass / fail determination unit, it is possible to detect a vertical bending defect.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of a bending inspection apparatus for a long molded product according to the present embodiment. FIG. 1 (a) is a diagram viewed from the side, and FIG. 1 (b) is a cross section of the molded product. Figure viewed from the direction,
FIG. 4C is a perspective view schematically showing a sensor mounting position.

The bending inspection apparatus includes a bottom plate 2a and a side plate 2b which rises vertically from one side edge of the bottom plate 2a.
And a long molded product (substantially U-shaped molded product such as a rain gutter in this embodiment) 1 placed and positioned on the support 2 in the longitudinal direction X. Vertical light detection sensors 3 (3a, 3b),... Disposed at three positions above both ends and the center along the longitudinal direction of the elongated molded product 1 positioned on the support 2 Horizontal light detection sensors 4 (4a, 4b),... Arranged at three positions at both ends and a center portion along the direction X, and these light detection sensors 3,. And a quality judgment unit 5 for judging the quality of the bend of the elongated molded product 1 based on the signal from.

Here, the vertical light detection sensor 3 and the horizontal light detection sensor 4 use transmission type photoelectric tubes in the present embodiment, and the light-emitting portions 3a, 4a and the light-receiving portions 3b, 4b are connected to each other. They are arranged to face each other.

Three vertical light detection sensors 3, 3, 3
Are arranged at a position separated from the side plate portion 2b by a predetermined distance s in the horizontal direction Y, and are arranged so that the light beam from the light emitting portion 3a is irradiated in the vertical direction Z in parallel with the side plate portion 2b. ing. That is, the light emitting unit 3a and the light receiving unit 3b
Are arranged to face each other in the vertical direction (vertical direction Z) with the bottom plate portion 2a interposed therebetween. Here, the predetermined distance s is exactly the distance from the side plate portion 2b to this light beam, and also a distance that serves as a reference value for judging the quality of the bending in the horizontal direction. In the present embodiment, the horizontal direction Y is a direction parallel to the upper surface of the bottom plate 2a, and the vertical direction Z.
Is a direction parallel to one side surface of the side plate portion 2b. Accordingly, when the support 2 tilts (this will be described later), the horizontal direction Y and the vertical direction Z also tilt accordingly.

Also, three horizontal light detection sensors 4,
4, 4 are arranged at a position separated by a predetermined distance s in the vertical direction Z from the bottom plate 2a, and the light beam from the light emitting unit 4a is irradiated in the horizontal direction Y in parallel with the bottom plate 2a. Are located in That is, the light emitting unit 4a and the light receiving unit 4b are arranged to face each other in the left-right direction (horizontal direction Y) with the side plate 2b interposed therebetween. Here, the predetermined distance s
Is exactly the distance from the bottom plate 2a to this light beam, and also the distance that is a reference value for judging the quality of the bending in the vertical direction.

The vertical light detection sensor 3 (3a, 3a)
b) and the portion of the support 2 on which the horizontal light detection sensor 4 (4a, 4b) is arranged, as shown in FIG.
An L-shaped notch 2c in side view for transmitting a light beam is formed. Thus, when the elongated molded article 1 is not on the support plate 2 or the like, the light beams emitted from the light emitting units 3a and 4a pass through the notch 2c and enter the light receiving units 3b and 4b. Will be.

As shown in FIG. 2, the support 2 has one side portion of the bottom plate portion 2a (one side portion near the side plate portion 2b) supported by a support shaft 12 with respect to a column 11a of a support frame 11. The other side of the bottom plate 2 a is rotatably connected to a telescopic rod 13 a of a cylinder 13 by a support pin 14. Also, the cylinder body 13b
Is rotatably attached to the support frame 11. In other words, by extending the telescopic rod 13a of the cylinder 13, the support shaft 12 is rotated about the support shaft 12 so as to lift the other side of the bottom plate 2a (indicated by a two-dot chain line in FIG. 2). Is available. Thereby, one side surface of the elongated molded product 1 placed on the support 2 can be reliably brought into contact with the side plate portion 2b. In this embodiment, the cylinder 13 is a cylinder with an auto switch, and automatically stops when the bottom plate 2a is inclined to a certain inclination angle (for example, 30 degrees).

Next, an inspection processing operation in the bending inspection apparatus having the above configuration will be described. The long molded article 1 to be inspected is placed on the support 2, and the cylinder 13 is driven to tilt the support 2. As a result, the bottom surface of the elongated molded product 1 (in this embodiment, the open end opened in a U-shape) is brought into contact with the bottom plate portion 2a, and one side surface of the elongated molded product 1 is brought into contact with the side plate portion 2b. Positioning can be performed in the state in which it is performed (the state shown in FIG. 1B).

At this time, if the long molded product 1 is a good product with no horizontal bending (no horizontal bending or within the judgment reference value), it is shown as a sensor installation image in the table of FIG. Thus, the elongated molded product 1 and the side plate portion 2b
Since there is no gap larger than the criterion value between the vertical light detection sensors 3, 3, 3 installed at three locations, the elongated molded product 1 blocks the light beams from the three vertical light detection sensors 3, 3, 3. The outputs of the detection sensors 3, 3, 3 are all turned off. However, here, when the light beam from the light emitting unit 3a is received by the light receiving unit 3b, the light beam is turned on, and when the light beam is blocked, the light beam is turned off.

On the other hand, when the long molded product 1 has a bending defect in the horizontal direction, there are two patterns shown as sensor installation images in the table of FIG. That is, when the central portion of the elongated molded product 1 is in contact with the side plate portion 2b (pattern 1), one or both (in this example, both) of the end portions are separated from the side plate portion 2b by the judgment reference value or more. Will be. As a result, the signal of the vertical light detection sensor 3 at one end or both ends (both ends in this example) is turned on, and the signal of the vertical light detection sensor 3 at the center is turned off. Further, when both ends of the elongated molded product 1 are in contact with the side plate portion 2b (pattern 2), the central portion is separated from the side plate portion 2b by a reference value or more. As a result, of the three vertical light detection sensors 3, 3, 3, the vertical light detection sensors 3,
The signal of No. 3 is off, and the signal of the vertical light detection sensor 3 at the center is on.

That is, when the elongated molded product 1 has a bending defect in the horizontal direction, at least one of the vertical light detecting sensors 3 is required in any of the above two patterns.
Is turned on, so that the quality of the signal can be judged by the pass / fail judgment unit 5 to detect a bending defect in the horizontal direction.

On the other hand, when the elongated molded product 1 is a good product with no vertical bending (no vertical bending or within the judgment reference value), as shown in the sensor installation image in the table of FIG. Since there is no gap between the elongate molded product 1 and the bottom plate portion 2a which is equal to or greater than the determination reference value, the elongate molded product 1
Are installed in three places, and the horizontal light detection sensors 4, 4, 4
, All the outputs of the three horizontal light detection sensors 4, 4, 4 are turned off. However, here, when the light beam from the light emitting unit 4a is received by the light receiving unit 4b, the light beam is turned on, and when the light beam is blocked, the light beam is turned off.

Similarly, when the elongated molded product 1 has a bending defect in the vertical direction, there are two patterns shown as sensor installation images in the table of FIG. That is, when the central portion of the elongated molded product 1 is in contact with the bottom plate portion 2a (pattern 1), one or both (in this example, both) of the end portions are separated from the bottom plate portion 2a by the judgment reference value or more. Will be. As a result, one end or both ends (in this example, both ends)
Are turned on, and the signal of the horizontal light detection sensor 4 at the center is turned off. In addition, when both ends of the elongated molded product 1 are in contact with the bottom plate 2a (pattern 2), the central portion is separated from the bottom plate 2a by a reference value or more. As a result, of the three horizontal light detection sensors 4, 4, 4, the signals of the horizontal light detection sensors 4, 4 at both ends are turned off, and the signal of the horizontal light detection sensor 4 at the center is turned on. .

That is, when the elongated molded article 1 has a bending defect in the vertical direction, at least one of the horizontal light detecting sensors 4 is required in any of the above two patterns.
Is turned on, and the quality of the signal is determined by the pass / fail determination unit 5, whereby a bending defect in the vertical direction can be detected.

The pass / fail judging section 5 has judged that any of the above detection results by the vertical light detection sensors 3, 3, 3 and the above detection results by the horizontal light detection sensors 4, 4, 4 are defective. In such a case, the elongated molded product 1 is determined to be defective in bending.

FIGS. 5 and 6 show an embodiment in which the bending inspection apparatus of the present invention is arranged on an extrusion molding line.

The extrusion molding line includes an extruder 81, a mold 82, a forming die 83, a take-off machine 84, a cutting machine 8
5, a conveyor 86, and an inspection step 87 in which the bending inspection apparatus of the present invention is arranged.

That is, the resin melted by the extruder 81 is formed into a predetermined shape (for example, a U-shape which is a rain gutter for a house) by a mold 82, extruded, and cooled and solidified by a next forming die 83. Then, it is taken off by a take-off machine 84 and cut by a next cutting machine 85 to a predetermined length. here,
The cutting dimensions are about 150 mm in width, about 100 mm in height, and about 4000 mm in length. After cutting to this size, the speed is increased by the conveyor 86 (movement speed of the molded product before cutting = 4 m).
/ Min, the moving speed after acceleration = 8 m / min), and transported to an inspection step 87 in which the bending inspection apparatus of the present invention is arranged.

The conveyed molded article 1 first strikes against a stopper 88 arranged at the end of the line (the end of the inspection process 87), and then extends and retracts the telescopic rod 13a of the cylinder 13 as shown in FIG. Then, it is rotated so as to lift the other side of the bottom plate 2a. Thereby, one side surface of the molded product 1 placed on the support 2 can be reliably brought into contact with the side plate portion 2b. Thereafter, the inspection is performed as described above, and the quality of the bending of the molded article 1 is determined. However, in this embodiment, as the vertical direction light detection sensor 3 and the horizontal direction light detection sensor 4, a small spot type reflection type photoelectric tube is used.
Are used, and if light is received from any of the light detection sensors, it is determined to be defective. Here, in the case of the present embodiment, the quality determination reference value of the bending in the horizontal direction and the vertical direction is both 10 mm.

After the inspection is completed in this way, the molded article 1 is put into the non-defective carriage 90a by the vacuum type transfer machine 89 installed above in the case of a non-defective article, and into the defective cart 90b in the case of a defective article. You. Then, the apparatus is configured such that defective products are immediately removed from the molding line.

[0036]

According to the method and the apparatus for inspecting the bending of a long molded product according to the present invention, the quality of the bending of the long molded product can be inspected accurately on a molding line. Therefore, there is no increase in work-in-progress and an increase in man-hours as in the conventional off-line measurement, and no inspection error due to the skill of the person performing the measurement occurs. In addition, since it is possible to perform a 100% inspection, waste such as outflow of defective products and disposal of molded products at the time of lot out is eliminated.

[Brief description of the drawings]

FIG. 1 shows a schematic configuration of a bending inspection device for a long molded product according to the present invention, wherein FIG.
(B) is a view seen from the cross-sectional direction of the molded product, and (c) is a perspective view schematically showing a sensor mounting position.

FIG. 2 is a diagram illustrating a mechanism for tilting a support.

FIG. 3 is an explanatory diagram summarizing the inspection principle of horizontal bending in the bending inspection apparatus of the present invention in a list format.

FIG. 4 is an explanatory diagram summarizing the inspection principle of the vertical bending in the bending inspection apparatus of the present invention in a list format.

FIG. 5 is an explanatory view showing the overall configuration of an extrusion molding line to which the bending inspection device of the present invention is applied.

FIG. 6A is an enlarged plan view showing an inspection step of the extrusion molding line, and FIG. 6B is a front view of the same.

FIGS. 7A to 7F are diagrams for explaining a conventional method for inspecting a bent product; FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elongated molded product 2 Support 2a Bottom plate part 2b Side plate part 2c Notch part 3 Vertical light detection sensor 4 Horizontal light detection sensor 5 Pass / fail judgment part

Claims (3)

[Claims] 1. A method for inspecting a longitudinal bending of a long molded product, comprising: forming a long molded product on a support having a bottom plate and a side plate rising vertically from one side edge of the bottom plate. Place the product with the bottom of the product in contact with the bottom plate and one side in contact with the side plate, and keep it constant between the side plate and both ends and center of one side of the long molded product Measure whether there is the above gap or not,
If there is at least one gap that is not less than a certain value, it is determined that the bending in the horizontal direction is defective, and there is a certain amount of gap between the bottom plate and the three places at both ends and the center of the bottom surface of the elongated molded product. A method for inspecting the bending of a long molded product, comprising determining whether or not there is a gap equal to or more than a predetermined value and determining that the bending is defective in the vertical direction. 2. An apparatus for inspecting the longitudinal bending of a long molded product, comprising a bottom plate portion and a side plate portion rising vertically from one side edge of the bottom plate portion. A support that is brought into contact with the bottom plate and positioned in a state where one side of the elongated molded product is in contact with the side plate, and both ends along the longitudinal direction of the elongated molded product positioned on the support And three places above the center,
A vertical direction light detection sensor arranged at a position separated by a predetermined distance in the horizontal direction from the side plate portion, and arranged to irradiate a light beam in a direction parallel to the side plate portion and vertically, and positioned on the support. Three locations at both ends and a central portion along the longitudinal direction of the elongated molded product,
A horizontal direction light detection sensor arranged at a position vertically separated from the bottom plate by a predetermined distance, and arranged so as to irradiate a light beam in a horizontal direction in parallel with the bottom plate, A bending inspection apparatus for a long molded product, comprising: a quality judgment unit for judging the quality of a bending based on a signal. 3. The bending inspection apparatus according to claim 2, wherein the vertical light detection sensor and the horizontal light detection sensor are transmission-type phototubes.