KR20070052886A - Control method of dimension change for plastic injection molding part of vehicle using 3dimensions scanner - Google Patents

Abstract

The present invention relates to a method for controlling the dimensional deviation of a plastic injection molded product for automobiles using a 3D scanner, and more particularly, to innovatively improve the existing approach to manage the dimensions of the injection molded products based on experience, Dimensional deviations such as volumetric shrinkage and warpage of the injection molded products are measured using 3D scanners to minimize the warpage and dimensional deviations of the overall or local products. It relates to a control method.

To this end, the present invention comprises the steps of measuring the position of the injection molded product by irradiating a laser beam on the injection molded product with a laser beam sensor; Measuring the position of the laser beam sensor using an infrared sensor with a camera; Receiving a signal from the laser beam sensor and the camera at a scanner main body and combining the position of the ejected article and the position of the laser beam sensor to process information; Measuring the relative amount of deformation by comparing the data measured in the step with the mold design data; It provides a method for controlling the dimensional deviation of plastic injection molding for automobiles using a 3D scanner comprising a.

Scanner, dimensional deviation, injection, thermal deformation test, laser beam, camera, optical lens

Description

Control method of dimension change for plastic injection molding part of vehicle using 3Dimensions scanner}

1A is a flow diagram illustrating one embodiment of a total measurement process and data processing method for a 3D scan and an injection process for dimension management in accordance with the present invention.

FIG. 1B is a flow diagram illustrating another embodiment of an overall measurement process and data processing method for an 3D scan and an injection process for dimension management in accordance with the present invention.

Figure 2 is a perspective view showing a state of measuring a three-dimensional injection molded product using a 3D scanner according to the present invention.

2a is a perspective view of a camera according to the present invention;

Figure 2b is a perspective view showing a laser beam sensor according to the present invention.

2C is a perspective view of a scanner body according to the present invention;

Figure 3 is an image showing the scan results before the heat deformation test for the injection conditions low mold surface temperature.

Figure 4 is an image showing the scan results after the heat deformation test for the injection conditions low mold surface temperature.

Figure 5 is an image showing the scan results before the heat deformation test for the injection conditions high mold surface temperature.

Figure 6 is an image showing the scan results after the heat deformation test for the injection conditions high mold surface temperature.

<Description of the symbols for the main parts of the drawings>

10: camera 11: object position detection unit

11a: optical lens 12: support

12a: fixed lever 13: tricycle

14 laser beam sensor 15 handle

15a: Button 16: Housing

17: protrusion 18: opening

20: injection molded product 21: desk

22: scan object support 23: scan controller

24: Scan PC 25: Camera Controller

26: scanner body 27: connector

The present invention relates to a method for controlling the dimensional deviation of a plastic injection molding for automobiles using a 3D scanner, and more particularly, the injection product is very difficult to manage because the molded product is changed in dimensions according to process conditions, work units or injection times. It is known that, based on experience, we have innovatively improved the existing approach to managing the dimensions of injection products, but by measuring the dimensional deviations such as the volume shrinkage and warpage of automobile injection parts before and after the thermal deformation test using a 3D scanner, The present invention relates to a method for controlling the dimensional deviation of plastic injection moldings for automobiles using a 3D scanner to minimize the warpage phenomenon and the dimensional deviation of the overall or locally occurring products.

In general, shrinkage of an injection product is an essential phenomenon that occurs when the density of the resin changes from the process temperature to the ambient temperature.

Automotive parts manufactured by the injection molding process have a very large numerical change in the product due to the nature of the injection molding process. Therefore, in order to control the dimensions of such an injection molded product, an accurate measuring method is required.

The existing measuring method mainly uses a step measuring method that checks interference with other components by using a gap ruler.

The injection product is very difficult to manage because the molded product's dimensions change according to process conditions, work units or injection counts, and the change in the dimensions of the injection products is closely related to the injection process conditions.

Therefore, in order to improve the injection process conditions, it is necessary to accurately measure the direction of volume shrinkage or warpage of the injection product itself.

However, the existing step measurement method has a problem that can be applied only in a limited situation where the gap of the product can be checked in order to measure the local numerical change of the injection molded product.

The present invention has been made in view of the above, and according to the experience, innovatively improved the existing approach to manage the dimensions of the injection products, dimensions such as volume shrinkage and warpage phenomenon of automobile injection molded products before and after thermal deformation test It is an object of the present invention to provide a method for controlling the dimensional deviation of plastic injection moldings for automobiles using a 3D scanner, which can minimize the warpage phenomenon and the dimensional deviation of a product occurring overall or locally by measuring the deviation using a 3D scanner.

In the present invention for achieving the above object is a method for controlling the dimensional deviation of the plastic injection molding for automobiles using the three-dimensional injection molding scanner,

Irradiating a laser beam on the injection-molded product with a laser beam sensor to measure the position of the injection-molded product; Measuring the position of the laser beam sensor using an infrared sensor with a camera; Receiving a signal from the laser beam sensor and the camera at a scanner main body and combining the position of the ejected article and the position of the laser beam sensor to process information; Measuring the relative amount of deformation by comparing the data measured in the step with the mold design data; Characterized in that comprises a.

In a preferred embodiment, in the dimensional deviation control method of the plastic injection molding for automobiles using the three-dimensional injection molding scanner,

Irradiating a laser beam on the injection-molded product with a laser beam sensor to measure the position of the injection-molded product; Measuring the position of the laser beam sensor using an infrared sensor with a camera; Receiving a signal from the laser beam sensor and the camera at a scanner main body and combining the position of the ejected article and the position of the laser beam sensor to process information; Measuring the relative amount of deformation by comparing the heat deformation test data and the heat deformation test data measured in the step; Characterized in that comprises a.

In a more preferred embodiment, the injection molded product is characterized in that the mold surface temperature is increased by a predetermined temperature.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1A is a flowchart illustrating an embodiment of a total measurement process and a data processing method for a 3D scan and an injection process for dimension management according to the present invention, and FIG. 1B is a total measurement process for a 3D scan according to the present invention. And a flow chart illustrating another embodiment of a data processing method and an injection process for dimension management, FIG. 2 is a perspective view illustrating a three-dimensional injection molded product using a 3D scanner according to the present invention, and FIG. 2B is a perspective view showing a laser beam sensor according to the present invention, and FIG. 2C is a perspective view showing a scanner main body according to the present invention.

The present invention relates to a method for controlling the dimensional deviation of a plastic injection molded product for automobiles using a 3D scanner to measure the amount of dimensional change before and after the thermal deformation test of the molded product.

The present invention is to measure the dimensional deviation, such as the volume shrinkage and warpage of the injection molded car before and after the thermal deformation test using a 3D scanner, to minimize the warpage phenomenon and dimensional deviation of the product occurring overall or locally There is a point.

Until now, 3D scanners have mainly used reverse engineering techniques to build 3D CAD models for competitors' products, and then use them to trace back the know-how of design technology.

The present invention proposes a method of controlling the dimensional deviation of the injection molded products before and after the thermal deformation test using the 3D scanner.

The 3D scanner utilized in the present invention includes a camera 10 to which an optical lens 11a is attached, a laser beam sensor 14 for irradiating a laser beam to the injection molded product 20, the camera 10 and a laser beam sensor ( It is composed of a scanner body 26 for storing data by combining the positions of the injection molded product 20 detected in 14).

The camera 10 includes an object position detecting unit 11 for detecting a position of an object through three optical lenses 11a, a support 12 for supporting the object position detecting unit 11, and the support stand. It consists of the trivet 13 provided in the lower part of (12).

The object position detecting unit 11 is an approximately long cylindrical shape installed horizontally on the upper end of the support 12, the three optical lenses (11a) are mounted in the longitudinal direction on the front surface of the object position detecting unit (11). The position of the laser beam sensor 14 is detected through the optical lens 11a.

The support 12 has a structure in which the piston is slidable in the vertical direction in the cylinder, and a fixed lever 12a is installed at one side thereof to adjust the length of the support 12, and a trivet is formed at the bottom of the support 12. 13) is installed.

The trivet 13 is made so that the three legs can be angled at an angle of 120 ° to stand the camera 10, the upper end can be folded and folded hinged to the support 12.

The laser beam sensor 14 has a rectangular-shaped housing 16, an opening 18 formed to irradiate a laser beam to one surface of the housing 16, and a handle attached to a lower end of the housing 16. 15 and a plurality of infrared sensors built into the edge of the housing 16 to be sensed through the optical lens 11a of the camera 10.

Rod-shaped protrusions 17 are formed on the upper, rear, and side surfaces of the housing 16, and a plurality of infrared sensors are also embedded in the protrusions 17, and the protrusions 17 have an injection-molded product 20. In case the light emitted from the optical lens 11a of the camera 10 interferes with the injection molded product 20 between the camera 10 and the laser beam sensor 14 or by the shape of the injection molded product 20. To protrude perpendicularly to each side of the housing 16.

The handle part 15 is installed at the lower end of the housing 16 so that the laser beam sensor 14 can be moved at various angles to scan the injection molded product 20, and the button 15a is provided at the upper end of the handle part 15. ) Is installed and the button 15a is pressed to irradiate the injection beam 20 with the laser beam. At this time, the injection molded product 20 is placed on the scan object support 21 placed on the desk 22 and scanned.

The scanner main body 26 includes a scan controller 23 receiving a signal from the laser beam sensor 14, a camera controller 25 receiving a signal from the camera 10, and information received from the scan controller and the camera controller. It consists of the scanning PC 24 to process. In this case, the scan controller 23, the camera controller 25, and the scan PC 24 are equipped with a connector 27 for connecting a power source.

Reference numeral 19 is a cable.

Referring to the operation of the 3D scanner composed of such a configuration as follows.

The camera 10 measures the exact position of the infrared sensor embedded in the housing 16 of the laser beam sensor 14 through the three optical lenses 11a. The scan for the three-dimensional injection molded product 20 is measured using an infrared sensor.

After holding the handle 15 so that the laser beam is irradiated to the injection molded product 20 through the opening 18 of the laser beam sensor 14, the laser beam sensor 14 is placed on the injection molded product 20, and then the handle The laser beam is irradiated to the injection molded product 20 by pressing the button 15a provided in the unit 15.

The position of the injection molded product 20 is determined by the combination of the position of the laser beam sensor 14 recognized by the camera 10 and the position of the object measured by the laser beam, and determines the position of the injection molded product 20. The process takes place at the scanner body 26.

In the present invention, as shown in FIG. 2, the injection molded product 20 (T / Gate Garnish) was scanned using a scanner, and the scanned measurement values are stored in the form of point group data.

Since the data obtained through the 3D scan is point cloud data, the Geomagic Qualify program extracts surface data from the point cloud data, and compares the extracted surface data with CAD-based design CAD data to measure the relative amount of deformation. do.

The injection process has various process variables such as mold temperature, injection speed, and packing pressure, and the optimum injection conditions can be found by measuring the dimensions of the injection products according to the process variables.

In the present invention, since the introduction of a 3D scanner for dimensional deviation control is the main purpose, one injection process variable called mold surface temperature is selected.

In other words, injection was performed for the existing injection conditions (condition 1) with low mold surface temperature and improved injection conditions (condition 2) with increased mold surface temperature, and 3D scan was performed on the manufactured injection products.

In addition, the thermal deformation test was performed for 4 hours at 90 ° C. in order to determine the effect on the thermal deformation, and then the dimensional change before and after thermal deformation was measured by performing 3D scanning again.

3 is an image showing a scan result before the heat deformation test for the injection conditions having a low mold surface temperature, Figure 4 is an image showing a scan result after a heat deformation test for injection conditions having a low mold surface temperature.

As shown in FIG. 3, in the case of the injection-molded product 20 manufactured under the injection conditions of a low mold surface temperature, the left part is lifted up (yellow area) and the right part is sinking (blue). It can be seen that the injection molded product 20 has an asymmetric dimensional change.

As shown in FIG. 4, the scan result of the injection molded product 20 after the heat deformation test manufactured by the injection condition of the low mold surface temperature is more asymmetric than the case before the heat deformation test (FIG. 3). It can be seen.

5 is an image showing a scan result before the heat deformation test for the injection conditions with a high mold surface temperature, Figure 6 is an image showing a scan result after the heat deformation test for injection conditions with a high mold surface temperature.

As shown in Fig. 5, the scan result of the injection-molded product 20 before the thermal deformation test manufactured under the injection condition of the high mold surface temperature shows that the left and right sides of the injection-molded product 20 are slightly lifted but show a symmetrical tendency ( Orange).

As shown in FIG. 6, after the heat deformation test manufactured by the injection condition of the high mold surface temperature, the scan result of the injection molded product 20 decreased the degree of deformation even more than before the heat deformation test (FIG. 5). Was maintained as it is (yellow).

Table 1 shows the dimension change amounts for the dimension control points A001, A002, A010, and A011 of FIGS. 3 to 6.

As shown in Table 1, in the case of the existing conditions using a low mold surface temperature, the amount of change before and after the heat deformation test tended to be very asymmetric, but when the improved conditions were introduced using the high mold surface temperature, the injection molded product 20 It can be seen that the symmetrical deformation amount is shown.

Increasing the mold surface temperature solved the problem of dimensional change by 3D scanner.

Therefore, the degree of improvement of the injection molded product 20 can be obtained quantitatively in terms of dimensional stability according to the process conditions by using the 3D scanner according to the present invention, and an optimized process condition can be proposed.

As described above, according to the method for controlling the dimensional deviation of the plastic injection molding for automobiles using the 3D scanner according to the present invention, it is possible to measure the local dimensional change amount for the injection molded product having a complicated structure that is difficult to measure using the 3D scanner. It is possible to measure the dimensional change of the product before and after the heat deformation test and the dimensional change in the bending direction, and to measure and compare the dimensional change for the injection products obtained under different injection conditions, suggesting improved injection conditions. can do.

Claims (3)

In the method of controlling the dimensional deviation of the plastic injection molding for automobiles using the three-dimensional injection molding scanner, Irradiating a laser beam on the injection-molded product with a laser beam sensor to measure the position of the injection-molded product; Measuring the position of the laser beam sensor using an infrared sensor with a camera; Receiving a signal from the laser beam sensor and the camera at a scanner main body and combining the position of the ejected article and the position of the laser beam sensor to process information; Measuring the relative amount of deformation by comparing the data measured in the step with the mold design data; Dimensional deviation control method of the plastic injection for the vehicle using a 3D scanner comprising a. In the method of controlling the dimensional deviation of the plastic injection molding for automobiles using the three-dimensional injection molding scanner, Irradiating a laser beam on the injection-molded product with a laser beam sensor to measure the position of the injection-molded product; Measuring the position of the laser beam sensor using an infrared sensor with a camera; Receiving a signal from the laser beam sensor and the camera at a scanner main body and combining the position of the ejected article and the position of the laser beam sensor to process information; Measuring the relative amount of deformation by comparing the heat deformation test data and the heat deformation test data measured in the step; Dimensional deviation control method of the plastic injection for the vehicle using a 3D scanner comprising a. The method of claim 2, wherein the injection molded product has a mold surface temperature increased by a predetermined temperature.

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