JP4543199B2 - Plastic molded product strain relief device - Google Patents

Description

  The present invention relates to a distortion removal method and apparatus for plastic molded articles, and more particularly to a distortion removal method and apparatus that can remove distortion in a very short time using a laser beam.

Conventionally, as a method for removing distortion of a plastic molded product, the plastic molded product is placed in a shape correction jig and placed in a heat treatment heating tank and heated to a constant temperature for several tens of minutes to several hours. A method of removing distortion is employed.
JP-A-11-198176

  In the conventional method for removing distortion of a plastic molded article, the plastic molded article must be placed in a heat-treatment heating tank, and it must be heated slowly over a long time to remove the strain. At the same time, since the entire plastic molded product after strain removal is heated to a high temperature, it cannot be rapidly cooled, and must be cooled slowly over a long period of time. However, there is a problem that it takes a long time.

  The present invention has been made in view of the current situation, and an object of the present invention is to provide a plastic molded product distortion removing method and apparatus capable of correcting distortion by removing distortion with high accuracy in a short time. .

  Another object of the present invention is to enable distortion to be removed without any problems even when the light absorption wavelength band of the material constituting the plastic molded product is deviated from the wavelength band of the laser beam. There is.

  Another object of the present invention is to simplify the apparatus configuration and reduce costs.

  Still another object of the present invention is to eliminate the need to apply excessive correction force to the plastic molded product when removing the strain even when the degree of deformation of the plastic molded product accompanying the occurrence of strain is large. is there.

The present invention also provides a laser light source for irradiating a strain generating portion of a plastic molded product with laser light, a laser light source driving means for driving the laser light source, a base jig for supporting the plastic molded product from the side opposite to the laser light irradiation , A fixed jig that supports the plastic molded product from the laser beam irradiation side other than the strain generating part and the deformed part accompanying the strain, and holds the plastic molded product between the base jig and fixes the plastic molded product. And a state in which the deformation of the deformed portion is corrected by irradiation of the laser light from the laser light source driven by the laser light source driving means, and when the deformation becomes zero, a distortion removal completion signal is output. and confirmation means, the input of the distortion removal completion signal from the confirmation means, characterized in that the provided control means for stopping the irradiation of the laser light from the laser light source.

  In the present invention, the confirmation means compares a sensor for detecting the amount of displacement of the deformed portion in the plastic molded product with a detection value from the sensor and a normal value, and outputs a distortion removal completion signal when the two values match. It is characterized by comprising a comparator.

In the present invention, the confirmation unit compares the image pickup mechanism that captures the deformed portion of the plastic molded product as an image and the image data from the image pickup mechanism and the regular data, and outputs a distortion removal completion signal when the two data match. It is characterized by comprising a comparator.
The present invention is also characterized in that the laser light source driving means is configured to move the laser light source in an arc shape or linearly by manual or automatic control.
In the present invention, it is also preferable that the confirmation unit detects displacement amounts at a plurality of locations of the deforming portion by the sensor, and obtains a detection value from the sensor and a normal value at each of the plurality of locations of the deforming portion by the comparator. The distortion removal completion signal is output when both values are matched and the values match.

  In the present invention, since the distortion is removed by irradiating the strain generating portion of the plastic molded product with a laser beam, unlike the conventional case, it is necessary to heat the plastic molded product using a heating tank for heat treatment. And the entire plastic molded product does not become hot. For this reason, distortion can be removed in a short time. In addition, since the strain generating part is sufficiently partially heated by the laser beam, the strain can be removed with high accuracy. In addition, since the entire plastic molded product does not become high temperature, it does not take a long time for cooling, and the work time for the entire strain removal can be greatly shortened.

  The present invention also provides a laser light source for irradiating a strain generating portion of a plastic molded product with a laser beam; a base jig for supporting the plastic molded product from the side opposite to the laser beam irradiation; A fixing jig that supports a part other than the part and the deformed part accompanying the strain and holds the plastic molded product between the base jig and fixes the plastic molded product; Confirmation means for confirming a state in which the deformation is corrected, and outputting a distortion removal completion signal when the deformation becomes zero; by inputting a distortion removal completion signal from the confirmation means, irradiation of the laser light from the laser light source Therefore, it is not necessary to forcibly correct the deformation by holding the deformed portion of the plastic molded product between both jigs. For this reason, even when the degree of deformation due to strain generation is large, it is not necessary to apply excessive external force to the plastic molded product, and prevent damage to the plastic molded product due to excessive external force loading. Can do.

  In the present invention, the confirmation means compares a sensor for detecting the amount of displacement of the deformed portion in the plastic molded product with a detection value from the sensor and a normal value, and outputs a distortion removal completion signal when the two values match. Since the configuration includes the comparator, the confirmation means can be configured at a relatively low cost.

  In the present invention, the confirmation unit compares the image pickup mechanism that captures the deformed portion of the plastic molded product as an image and the image data from the image pickup mechanism and the regular data, and outputs a distortion removal completion signal when the two data match. Since it is made up of a comparator, the automatic control state by the confirmation means can be confirmed on the monitor as an image by the operator.

The present invention will be described below with reference to the present invention.
FIG. 1 shows a strain relief device for a plastic molded product 2 according to a first embodiment of the present invention. This strain relief device 1 irradiates a strain generating portion of a plastic molded product 2 with a laser beam 3. A laser light source 4; a base jig 5 for supporting the plastic molded product 2 from the side opposite to the laser light irradiation; and a fixing jig 6 for supporting the plastic molded product 2 from the laser light irradiation side. No. 2 is configured such that a portion other than the strain generation portion and the deformation portion accompanying the strain generation is sandwiched and fixed between the jigs 4 and 5.

  Each plastic molded product 2 manufactured from the same mold has almost the same position, size, etc. of the strain generating portion, and the portion where deformation occurs due to the strain generation, that is, the position of the deforming portion and the amount of displacement. Etc. are almost the same. Therefore, when the plastic molded product 2 is held by both the jigs 4 and 5, it is very easy to clamp and fix the plastic molded product 2 while avoiding the distortion generating portion and the deformed portion.

  The laser light source 4 is composed of, for example, a semiconductor laser, and the laser light 3 emitted from the laser light source 4 is applied to the strain generating portion of the plastic molded product 2.

  If the laser light source 4 is normally fixed at a predetermined fixed position, the laser light 3 can be irradiated to the entire area of the strain generating portion. However, depending on the position and size of the strain generating portion, the laser light source It may be necessary to move 4. Therefore, in such a case, as indicated by arrows A and B in FIG. 1, the laser light source 4 can be moved in an arc shape or linearly by manual or automatic control.

  In addition, depending on the material of the plastic molded product 2, the light absorption wavelength band may be shifted from the wavelength band of the laser beam 3, and in this case, the laser beam 3 is irradiated on the strain generating portion of the plastic molded product 2. Even so, the distortion cannot be removed. Therefore, in such a case, the laser light absorber is applied to the strain generating portion by application or other methods, and then the laser light 3 is irradiated. As this laser light absorber, for example, when the laser light source 4 is composed of a semiconductor laser, an infrared absorber is used as the laser light absorber.

  In the case of using this laser light absorbent, if the laser light absorbent is accurately attached to the strain generating portion, even if the other portions are irradiated with the laser light 3, the laser light absorbent is accompanied. Since there is no adverse effect on the plastic molded product 2, the control when moving the laser light source 4 is rather easy.

  As shown in FIG. 1, a sensor 7 for detecting a displacement D of the deformed portion moves in the direction of arrow C at a portion where the plastic molded product 2 is deformed, that is, in the vicinity of the deformed portion. As shown in FIG. 2, this sensor 7 constitutes confirmation means 9 together with the comparator 8.

  That is, the confirmation means 9 confirms the state in which the deformation of the deformed portion is corrected by the irradiation of the laser beam 3, and outputs a distortion removal completion signal when the deformation becomes zero. The distortion removal completion signal is input to the driving means 10 for driving the sensor 7, the laser light source driving means 11, and the control means 12 for controlling the laser light source 4. And the control means 12 controls the laser light source 4 by the input of the said distortion removal completion signal, and stops irradiation of the laser beam 3. FIG.

  Explaining this in more detail, the sensor 7 constituting the confirmation means 9 moves in the direction of the arrow C along the deformation portion by driving of the drive means 10, and the displacement amount D of, for example, five measurement points on the deformation portion. More specifically, the distance to the plastic molded product 2 is detected, and each detected value is sent to the comparator 8 and is compared with a normal value stored in the comparator 8 in advance. It has become. When the detected values from the sensor 7 and the normal values all match at the five measurement points, a distortion removal completion signal is output from the comparator 8 and the comparison state in the comparator 8 is: It is displayed on the monitor 13 shown in FIG. 2, and can be visually confirmed by the operator.

  FIG. 3 shows an example of the display screen of the monitor 13 during the distortion removal. In FIG. 3, the detected value and the normal value at the second and third measurement points among the five measurement points. Indicates a state where they do not yet match.

Next, the operation in the present embodiment will be described.
When removing the strain, the plastic molded product 2 is first positioned by holding a portion of the plastic molded product 2 other than the strain generating portion and the deformed portion accompanying the strain between the base jig 5 and the fixing jig 6. Fix it.

  Next, the laser light source 4 is activated via the control means 12 to irradiate the laser light 3 onto the strain generating portion of the plastic molded product 2 and the laser light source driving means 11 is driven to move the laser light source 4 to the arrow A or Move in direction B. Of course, it may not be necessary to move the laser light source 4, and in this case, the laser light source 4 remains stationary.

  When the distortion generating part is irradiated with the laser light 3, the distortion is gradually removed, and the displacement D of the deforming part accompanying the distortion gradually decreases. The state is confirmed by the confirmation means 9 including the sensor 7 and the comparator 8, and when the displacement amount D becomes zero, a distortion removal completion signal is output from the comparator 8. The control means 12 receives this distortion removal completion signal and controls the laser light source 4 to stop the irradiation of the laser light 3.

  The plastic jig 2 is clamped and fixed by the base jig 5 and the fixing jig 6, but the deformation of the deformed portion due to the distortion is forcibly corrected by both jigs 5 and 6. Instead, it is only necessary to irradiate the strain generating portion with the laser beam 13, so even if the deformation degree of the deformed portion is large, an excessive force is applied to the plastic molded product 2 to damage the plastic molded product 2. There is no fear. Moreover, since the irradiation of the laser beam 3 is automatically stopped when the distortion of the distortion generating portion is removed, the work does not require skill.

  FIGS. 4 to 5 show a second embodiment of the present invention. Instead of the confirmation means 9 in the first embodiment, confirmation means 19 comprising a TV camera 17 and a comparator 18 is shown. Is used.

  That is, as shown in FIG. 4, the TV camera 17 captures the degree of deformation of the deformed portion of the plastic molded product 2 as an image, and the image data captured by the TV camera 17 is sent to the comparator 18. When the two data match each other, the distortion removal completion signal is output from the comparator 18.

FIG. 6 shows an example of the comparison state in the comparator 18, where the image with the symbol E in the display screen of the monitor 13 is the normal data image, and the image with the symbol F is the image data from the TV camera 17. When the images E and F coincide with each other, the distortion removal is completed.
Other points are the same as those in the first embodiment, and the operation is also the same.

  Thus, unlike the sensor 7, the TV camera 17 does not need to be moved, so that the driving means 10 (see FIG. 2) is unnecessary, and the distortion is instantaneously removed by the irradiation of the laser beam 3. Even small deformations can be sufficiently dealt with.

  FIG. 7 shows a third embodiment of the present invention, in which a base jig 25 and a fixing jig 26 are used instead of the base jig 5 and the fixing jig 6 in the first embodiment. It is a thing.

  In other words, as shown in FIG. 7, the base jig 25 and the fixing jig 26 can forcibly correct the deformation caused by the distortion of the plastic molded product 2 by holding and fixing the plastic molded product 2. Thus, the laser light 3 from the laser light source 4 is applied to the strain generating portion in a state where the deformation of the plastic molded product 2 is corrected by both jigs 25 and 26.

By the way, since the fixing jig 26 is located on the irradiation side of the laser beam 3, the fixing jig 26 is provided with an opening 26a for exposing the strain generating portion. Even in a state where the molded product 2 is clamped and fixed, the laser beam 3 can be irradiated to the strain generating portion without any trouble.
Other points are the same as those in the first embodiment, and the operation is also the same.

  In the third embodiment, the case where the fixing jig 26 is provided with the opening 26a to expose the strain generating portion has been described. However, the same effect can be obtained by using a notch instead of the opening 26a. Can be obtained.

  FIG. 8 shows a fourth embodiment of the present invention, in which a fixing jig 36 is used in place of the fixing jig 26 in the third embodiment.

That is, as shown in FIG. 8, the fixing jig 36 is entirely made of a laser light transmitting material, for example, a transparent material when the laser light source 4 is composed of a semiconductor laser. Even when the strain generating part is covered with the tool 36, the laser light 3 can be irradiated to the strain generating part.
In addition, about another point, it has the same structure as the said 3rd Embodiment, and an effect | action is also the same.

  Thus, in the case of the present embodiment, since the laser beam 3 irradiation side of the plastic molded product 2 can be covered including the distortion generating portion, deformation correction of the plastic molded product 2 by both jigs 25 and 36 is possible. The state can be made more stable.

  In the fourth embodiment, the case where the entire fixing jig 36 is formed of the laser beam transmitting material has been described. However, only the portion corresponding to the strain generating portion is formed of the laser beam transmitting material. If so, the intended purpose can be achieved. Therefore, for example, a jig in which a laser beam transmitting material is fitted into the opening 26a of the fixing jig 26 shown in FIG. 7 may be used.

  As described above, the plastic molded product strain removing method and apparatus therefor according to the present invention are useful as a strain removing method and apparatus using laser light, and can easily remove strain particularly in a very short time. It is suitable as a method and apparatus for removing distortion.

It is a block diagram which shows the distortion removal apparatus of the plastic molded product which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structure of the control mechanism in the apparatus of FIG. It is explanatory drawing which shows an example of the display screen of the monitor of FIG. FIG. 3 is a view corresponding to FIG. 1 showing a second embodiment of the present invention. FIG. 5 is a view corresponding to FIG. 2 similar to FIG. 4. FIG. 5 is a view corresponding to FIG. 3 similar to FIG. 4. FIG. 6 is a view corresponding to FIG. 1 showing a third embodiment of the present invention. FIG. 6 is a view corresponding to FIG. 1 and showing a fourth embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Strain removal apparatus 2 Plastic molded product 3 Laser beam 4 Laser light source 5,25 Base jig 6, 26, 36 Fixing jig 7 Sensor 8, 18 Comparator 9, 19 Confirmation means 10 Control means 11 Laser light source drive means 13 Monitor 17 TV camera 26a Aperture D Displacement E Regular data image F Image data image

Claims (5)

A laser light source for irradiating a laser beam to a strain generating portion of a plastic molded product ;
Laser light source driving means for driving the laser light source;
A base jig for supporting a plastic molded product from the side opposite to the laser beam irradiation ;
A fixed jig that supports the plastic molded product from the laser beam irradiation side other than the strain generating part and the deformed part accompanying the strain, and holds the plastic molded product between the base jig and fixes the plastic molded product. Ingredients ,
Confirming means for confirming a state in which the deformation of the deformed portion is corrected by the irradiation of the laser light from the laser light source driven by the laser light source driving means, and outputting a distortion removal completion signal when the deformation becomes zero and,
And a control means for stopping the irradiation of the laser light from the laser light source in response to the input of the distortion removal completion signal from the confirmation means. The confirmation means includes a sensor that detects the amount of displacement of the deformed portion in the plastic molded product, and a comparator that compares a detected value from the sensor with a normal value and outputs a distortion removal completion signal when both values match. The distortion removal apparatus for a plastic molded product according to claim 1, further comprising: The confirmation means includes an imaging mechanism that captures a deformed portion in a plastic molded product as an image, and a comparator that compares image data from the imaging mechanism with normal data and outputs a distortion removal completion signal when the two data match. The distortion removal apparatus for a plastic molded product according to claim 1, further comprising:   2. A plastic molded product distortion removing apparatus according to claim 1, wherein the laser light source driving means is configured to move the laser light source in an arc shape or linearly by manual or automatic control.   The confirmation means detects displacement amounts at a plurality of locations of the deforming portion by the sensor, compares the detected values from the sensor with normal values at the plurality of locations of the deforming portion by the comparator, and both values are obtained. The distortion removal apparatus for a plastic molded product according to claim 2, wherein the distortion removal completion signal is output when all coincide.

Images