JP3029667B2 - Method for analyzing the cause of failure of composite resin, SMC, thermoplastic resin - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for analyzing the cause of failure of a press-formed product of a composite resin, SMC, or a thermoplastic resin.

2. Description of the Related Art In recent years, a front panel, a body panel, a hood, a bathtub, and the like of an automobile have been press-formed with a composite resin such as FRP.

In general, in press molding, first, a trial production is performed using a trial press, and the press of the slide lowering position, pressing speed, lower limit of slide, pressing force, pressing time, etc. corresponding to a predetermined mold is performed. This is done by determining the conditions.

Problems to be Solved by the Invention However, composite resins such as FRP have inconsistent properties such as curing speed and deformation resistance, and material dimensions and weights are not always constant. Is not easy to control, and the molded product tends to vary. Further, the molded article is greatly affected by the control of the inclination of the slide and the equilibrium support device, and it is difficult to maintain a constant quality.

Conventionally, as molding data for each molded product, general molding conditions such as a mold temperature, a pressing force, and a molding speed are detected, and the cause of the failure cannot be accurately analyzed.

For this reason, an operator modifies the operating parameters of the press molding apparatus based on his or her experience, so that defective products are not generated.

Means for Solving the Problems The present invention has been made in view of the above points, and in order to solve the above problems, an equilibrium support device that equilibrately supports slides at four corners of a bed of a press molding device is provided. It is for vertically forming and press-forming composite resin, SMC, thermoplastic resin.When pressing with the above-mentioned press forming equipment, mold temperature, material weight, pressing force, pressing time, equilibrium support force Detects a large number of molding data of molding conditions such as molding conditions, and molding conditions of the inclination of the slide at the time of pressurization and release, and stains, cracks, scratches, chips, poor flow, uncured, dimensions of molded products Analyze the molding data of the pressurization process, which is the cause of defective and defective products, by inspecting defects, color unevenness, blisters, blisters, drops, pinholes, floating glass, etc. Result, stains, cracks, scratches, chips on the molded product ,
Poor flow, uncured, poor dimension, uneven color, blister, drop,
In the case of defective products due to pinholes, glass floating, etc., regarding the molding data of press molding of defective products,
As described above, a composite resin characterized by detecting abnormal molding conditions of defective product occurrence by comparing molding data analyzed in advance for the non-defective product and the pressurizing step of defective product occurrence and analyzing the cause of the defective product, It is an object of the present invention to provide a method for analyzing the cause of failure of a thermoplastic resin press-formed product.

Examples Hereinafter, the present invention will be described based on examples.

FIG. 1 et seq. Show one embodiment of press molding of a composite resin of FRP. The press forming apparatus 1 includes a pressurizing cylinder 3 disposed on a crown 2, and a slide 5 slidably disposed between uprights 4 so as to face a bed 6. At the four corners of the bed 6, equilibrium support devices 7 for hydraulic servo cylinders are suspended, and feedback control is performed by a position detector 8 provided by an encoder attached thereto, and the slide 5 is supported at equilibrium by the equilibrium support devices 7. The sheet material 12 to be put between the lower die 10 and the upper die 11 of the die 9 fixed to the bed 6 and the slide 5 can be press-formed with high precision.

A pressure detector (not shown) is connected to the pressurizing cylinder 3 and the equilibrium support device 7 to the press forming apparatus 1 configured as described above, and the pressurizing force from the start of pressurization to the mold release and the equilibrium support pressure are adjusted. It can be set and detected in a plurality of stages, and a position detector (not shown) is provided on the slide 5 to set a slide high-speed approach position, a slide slow-down position, a slide lower limit position, and the like. In addition, a temperature detector (not shown) is attached to a predetermined position of the mold 9 to control the temperature or to detect the temperature. Further, the position detector 8 of the above-described equilibrium support device 7 can set or detect the equilibrium support position, and
The tilt of the slide 5 can be controlled or detected by the two position detectors 8 facing each other. In addition, the pressurizing time of the slide 5 and the like are set or detected, and these set values, the detected forming data, and the weight and thickness of the sheet material 12 are determined by the control unit 13 of the press forming apparatus 1.
To be stored as appropriate.

Therefore, when press-molding the sheet material, the weight of the sheet material of the molding number of each molded product, the mold temperature, the pressurizing time from the start of pressurization to the pressurization, a plurality of steps at a fixed time during pressurization Each output and the maximum output of the slide and the equilibrium support device at each time, each output of the slide and the equilibrium support device in a plurality of steps at a fixed time during pressurization, each output of the equilibrium support device at the time of release, pressurization process And the inclination of the slide at a plurality of stages at a fixed time during the release process, especially the inclination of the slide at the time of pressurization and release, and the molding data of other molding conditions are detected and stored in the storage unit of the control device 13. I will enter.

Then, as shown in FIG. 2, at the molded product inspection station, the molded product is contaminated, cracked, scratched, chipped, has a poor flow, has not been cured, has a poor size, is uneven in color, has a blister, has fallen, has a pinhole,
The glass float is visually inspected, or mechanically inspected by an ultrasonic flaw detector or an optically operated surface inspector 14, etc., and the result is input through a terminal 15 such as a handy terminal and the control device 13 Data is sent to

As a result of the inspection of the molded product in this way, the molded product is stained, cracked, scratched, chipped, defective in flow, uncured, defective in dimension, uneven in color, blistered, dropped, pinhole, floating glass, etc. If it is determined that the molded product is defective, as shown in FIG. 3, the inspection result of each molded product and the molding data are automatically compared via the control device, and an abnormality in the molding data of the defective product is detected to determine the defect. Analyze the cause. A large amount of data necessary for press molding is collected in the molding data. Since the molding data of the pressurization process that causes the defect is detected in detail, a control unit can determine the item that failed and its cause. It can be easily and in detail examined with a computer built into the computer or, if necessary, with another computer. If the necessary molding data is insufficient,
A new detector is installed to detect the molding data, and the molding data will be prepared sequentially.

In this way, inspection data can be automatically tabulated for each inspection item, etc., and a large number of molding data can be stored.
In addition to directly comparing the molding data, analysis can be easily performed with reference to other molding data.

In the above, the sheet material of the composite resin of FRP has been described, but the present invention can be similarly applied to a press-molded material of SMC and thermoplastic resin.

Effect of the Invention As described above, in the present invention, it is possible to improve the quality of press molding of composite resin, SMC, and thermoplastic resin whose properties such as curing speed and deformation resistance are not constant. If the product is defective, the molding data of the inspection result can be automatically compared with the molding data of the molding conditions for the non-defective product detected in advance and analyzed, and the cause of the defective product can be easily identified. Quality can be improved. In particular, since the molding conditions of the inclination of the slide at the time of pressurization and demolding supported by the equilibrium support device can be detected and compared with those of molding data of defective products, general molding such as mold temperature and pressing force In addition to the conditions, it is possible to investigate the causes of the molding conditions for the inclination of the slide at the time of pressurization and release that directly affect the quality. The quality of the thermoplastic resin can be improved.

[Brief description of the drawings]

FIG. 1 is a front view of a press forming apparatus according to an embodiment of the present invention,
FIG. 2 is an explanatory diagram of the input of the handy terminal of the above, and FIG. 3 is a block diagram for explaining the analysis of the defective press-formed product of the above. DESCRIPTION OF SYMBOLS 1 ... Press molding device, 3 ... Pressure cylinder, 5 ... Slide, 7 ... Balance support device, 8 ... Position detector, 9 ... Mold, 12
... sheet material, 13 ... control device, 15 ... terminal.

Claims (1)

(57) [Claims] An equilibrium support device for equilibrium support of slides is provided at four corners of a bed of a press molding device to press-mold a composite resin, SMC, or a thermoplastic resin. When pressing with a molding machine, molding data of molding conditions such as mold temperature, material weight, pressing force, pressurizing time, equilibrium support force, and molding conditions of slide inclination during pressurization and release from mold Detects a large number of data,
Analyze the molding data of the pressurization process which is the cause of non-defective products and defective products by inspection for cracks, scratches, chipping, poor flow, uncured, defective dimensions, uneven color, blisters, drops, pinholes, floating glass, etc. As a result of inspection of the molded product after molding with a press molding device, dirt, cracks, scratches, chipping, poor flow, uncured, dimensional defects, uneven color, blistering, dropping, pinholes, glass floating etc. of the molded product If it is a defective product, the molding data of press molding with defective product is compared with the molding data analyzed in advance on the pressurizing process of good product and defective product as described above. A method for analyzing the causes of press molded product failure of composite resin, SMC and thermoplastic resin, characterized by detecting the failure and analyzing the cause of the defective product.