JP2730567B2 - Judgment device for discarded products and good products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discarded or non-defective product used in a die casting machine or an injection molding machine capable of taking out a plurality of products in one shot.

[0002]

2. Description of the Related Art Conventionally, for example, in the early stage of starting a casting machine, it is difficult to adjust the mold temperature of the casting machine to the casting conditions from the beginning, so that the mold temperature satisfies predetermined casting conditions. Until the casting is performed, a predetermined number of shots are cast. Then, the die temperature is measured with respect to the number of shots, and whether the number of shots or the temperature of the die satisfies a predetermined casting condition is automatically detected to determine whether the product is discarded or non-defective. (For example, JP-A-61-92769) is known.

[0003]

However, when the above-described technique is applied to a casting machine having a plurality of cavities, the mold temperature in each cavity cannot be made to have the same temperature distribution. Even if a cast product molded in one of the cavities satisfies the quality as a non-defective product, a product molded in another cavity does not always satisfy the quality as a non-defective product. For this reason,
There is a possibility that discarded products and non-defective products are mixed in casting products molded in other cavities, even at the reference temperature of the mold temperature or the number of shots that can obtain good quality in a certain cavity . Therefore, a casting molding machine having a plurality of cavities, which automatically detects whether or not the number of shots or the mold temperature satisfies one casting condition, erroneously determines that a good product is a discarded product. Or
There is a problem that a discarded product is erroneously determined to be a good product.

[0004] It is an object of the present invention to provide a discarded / non-defective discriminating apparatus capable of reliably and automatically judging discarded or non-defective products even in a molding machine capable of taking out a plurality of products in one shot. And

[0005]

SUMMARY OF THE INVENTION The present invention provides a molding machine having a plurality of cavities for molding a plurality of products by pressurizing a molten material press-fitted in one shot, and a one-shot molding machine. A condition detecting means for detecting a forming condition of a product to be formed by a shot, and a forming condition of the product detected by the condition detecting means are manufactured without stability for all products formed by one shot. When the first molding condition is satisfied, all products molded in one shot are determined as discarded products, and all products molded in one shot can be stably manufactured. If the molding conditions are satisfied, all products molded in one shot are judged as non-defective products, and the first molding condition and the second molding condition are determined.
When the molding conditions are not satisfied, a technical means including a judging means for judging that a plurality of products molded in one shot include a discarded product and a non-defective product is employed.

[0006]

According to the present invention, the molding condition of the product molded by one shot in the molding machine is the first molding condition under which all products molded by one shot are manufactured without stability. , And whether or not all products formed by one shot satisfy the second forming condition that can be manufactured stably. That is, when the molding condition of the product satisfies the first molding condition, all products molded in one shot are determined as discarded products. When the molding condition of the product satisfies the second molding condition, all the products molded in one shot are determined as non-defective products. Further, when the molding condition of the product does not satisfy the first molding condition and the second molding condition, it is determined that the discarded product and the non-defective product are mixed in a plurality of products molded in one shot. .

[0007]

【Example】

[Structure of the first embodiment] Next, an apparatus for judging discarded or non-defective products according to the present invention will be described with reference to an embodiment shown in the drawings. FIG. 1 is a diagram showing an apparatus for determining a discarded product and a good product. The discarded product / non-defective product determination device 1 includes a die casting molding machine 2, a sorting device 3, a control device 100, and the like. In the die casting molding machine 2, first to third cavities 7 to 9 into which a molten metal (molten metal: aluminum alloy) is injected from an injection cylinder (not shown) through a feeder unit 6 in one shot are formed. The fixed mold 10 is disposed so as to face the fixed mold 10, and is displaced so as to be in close contact with the fixed mold 10, so that the first to third cavities 7 to
The movable die 4 is configured to cast three die-cast products (for example, an end frame of an alternator) by pressurizing the molten metal press-fitted into the mold 9, and a driving device 5 for driving the movable die 4. .

The sorting device 3 transports three die-cast products cast in one shot to a box (not shown) for stocking as discarded products, and is cast in one shot. Conveyance path 12 for sending three die-cast products as non-defective products to the next process. A box for stocking discarded products and non-defective products in three die-cast products cast in one shot ( (Not shown). In addition, the sorting device 3 includes the transport paths 11 to 1
Branch plate 14 for distributing die-cast products to 3, 1
5 and these branch plates 14 and 15 are connected to the link mechanism 14.
a, air cylinders 16, 17 driven via 15a
It has.

The control device 100 includes a mold temperature measuring circuit 10
1 and a determination circuit 102. The mold temperature measuring circuit 101 is a contact-type mold temperature sensor such as a thermocouple that detects a mold temperature near the first cavity 7 provided at a position farthest from the feeder unit 6 in the fixed mold 10. The mold temperature is measured based on the output of 18. The mold temperature sensor 18 is a condition detecting means of the present invention, and converts the mold temperature near the first cavity 7 into an electric signal and outputs the electric signal to the mold temperature measuring circuit 101. And the mold temperature measurement circuit 1
01 outputs a detection signal corresponding to the measured mold temperature to the determination circuit 102.

The determination circuit 102 is a determination means of the present invention, and as shown in the graph of FIG. 2, the mold temperature is the minimum value Tmin (for example, 15 minutes) of the reference temperature which is the first casting condition.
If the temperature falls below 0 ° C.), it is determined that the area is the discarded product area A. The minimum value Tmin of the reference temperature is the first to third
This is the limit temperature at which all die-cast products cast in the cavities 7 to 9 are discarded products (defective products).

The determination circuit 102 determines that the mold temperature is equal to the second
The maximum value Tmax of the reference temperature (for example, 2
If the temperature is higher than (00 ° C.), it is determined to be the non-defective area B. The maximum value Tmax of the reference temperature is a limit temperature at which all the die-cast products cast in the first to third cavities 7 to 9 become non-defective products.

Further, the judgment circuit 102 determines that the mold temperature is higher than the minimum value Tmin (for example, 150 ° C.) of the reference temperature and that the maximum temperature Tmax (for example, 200) of the reference temperature.
(° C.), it is determined that the region is a mixed region C of discarded products and non-defective products. Then, the determination circuit 102 controls the air cylinder 16 of the distribution device 3 based on the determination result.
17 is instructed to sort the three die-cast products into the three conveying paths 11 to 13.

[Operation of the First Embodiment] Next, the operation of the discarded product / non-defective product judgment apparatus 1 of this embodiment will be briefly described with reference to FIGS. Molten metal is injected from the injection cylinder into the first to third cavities 7 to 9 formed between the fixed mold 10 and the movable mold 4 via the feeder unit 6, and the movable mold 4 is moved to the fixed mold. By closely adhering to 10, three die-cast products having a predetermined shape are cast. At this point, the three die-cast products are connected by a runner (not shown), and these are taken out of the first to third cavities 7 to 9 and separated by a robot or the like. The three die-cast products are conveyed to the entrances of the conveying paths 11 to 13 and are sorted into a discarded product area A, a non-defective product area B, and a mixed area C of discarded and non-defective products according to the setting positions of the branch plates 14 and 15. Can be

FIG. 3 is a flowchart showing a basic control program of the apparatus 1 for judging discarded products and non-defective products. This flowchart is executed during the operation of the die casting molding machine 2. First, it is determined whether or not the movable mold 4 and the fixed mold 10 are in close contact with each other and preparation for a shot is completed (step S1). If the determination result of step S1 is No, the process of step S1 is repeated.

If the result of the determination in step S 1 is Yes, the fixed mold 1 detected by the mold temperature sensor 18 is
The mold temperature T near the 0 first cavity 7 is measured (step S2).

Next, the mold temperature T near the first cavity 7 of the fixed mold 10 is reduced to a minimum value Tmin (for example, 1) of the reference temperature.
It is determined whether the temperature has fallen below 50 ° C.) (step S3). If the determination result of step S3 is Yes, that is, if T ≦ Tmin, it is determined that the area is the discarded product area A (see the graph of FIG. 2) (step S4), and the branch plate 14, A drive signal is output to the air cylinders 16 and 17 so as to open the transport path 11 at 15 (step S5). After that, the process returns to step S1.

As described above, the die-cast product cast in the temperature range of T ≦ Tmin has the first to third cavities 7 to 9.
All die-cast products cast in the market are discarded (defective products)
Automatically dispose of or dissolve again.

If the result of the determination in step S3 is No, whether the mold temperature T near the first cavity 7 of the fixed mold 10 has risen above the maximum value Tmax (for example, 200 ° C.) of the reference temperature. It is determined whether or not it is (step S6).
If the determination result of step S6 is Yes, that is, if T ≧ Tmax, it is determined that the area is the non-defective area B (see the graph of FIG. 2) (step S7). Air cylinder 1 so as to open transport path 12
A drive signal is output to 6 and 17 (step S8). After that, the process returns to step S1.

As described above, the die-cast product cast in the temperature range of T ≧ Tmax has the first to third cavities 7 to 9.
Since all the die cast products cast in the above are non-defective products, they are conveyed to the next process by a conveyor, a robot, or the like.

If the result of the determination in step S6 is No, that is, if Tmin <T <Tmax, it is determined that the area C is a mixed area of discarded products and non-defective products (step S9), and branching is performed. A drive signal is output to the air cylinders 16 and 17 so that the transport path 13 is opened by the plates 14 and 15 (step S10). After that, the process returns to step S1.

As described above, among the die-cast products cast in the temperature range of Tmin <T <Tmax, non-defective products and discarded products (defective products) are included in the die-cast products cast in the first to third cavities 7 to 9. Since they are mixed, the operator inspects all the parts, removes only discarded products, and removes non-defective products.
Also, discarded products are automatically discarded or dissolved again.

In the flowchart of FIG. 3, three areas are determined during the operation of the die casting molding machine 2. However, the three areas are determined until the casting conditions of the casting are stabilized. Is also good. That is, only at the initial stage of the start-up of the die-casting molding machine 2 (including when the die-casting molding machine 2 is stopped after the startup, or when the die-casting molding machine 2 is restarted after being stopped due to power failure, failure, etc.) 3
The determination of one area may be performed. In particular,
When the number of shots is a predetermined number of shots (10 times) or when the operation time according to the number of shots has elapsed, the determination of the three regions is completed, and all of the castings cast in the first to third cavities 7 to 9 are removed. It may be determined that the product is good.

[Effects of the First Embodiment] As described above, the first embodiment
In the die casting molding machine 2 having the third to seventh cavities 7 to 9, the maximum value and the minimum value are set in the reference temperature of the mold temperature, so that all the cast products cast in one shot are discarded products. It is easy to determine a good product. As a result, it is possible to completely prevent a discarded product from flowing out to the next process by mistake and a non-defective product from being discarded by mistake.

Further, since it is not necessary to detect the mold temperature for each cavity or to set the reference number of shots for each cavity, the number of determination circuits can be reduced, and the equipment cost is low. Thus, realization at an actual production site becomes easy. Note that the above determination method can be applied not only to the mold temperature but also to all other casting conditions, and a region that reliably deviates from the casting condition (a region that satisfies the first molding condition) is automatically discarded. All the areas where the casting conditions are unstable (the areas where the first and second molding conditions are not satisfied) are checked. In a region where the casting conditions are stable (a region satisfying the second molding condition), if the casting is fluidized by performing checkless or lot checking, the number of inspection steps can be significantly reduced.

[Modification] In this embodiment, a contact-type mold temperature sensor 18 is used as a condition detecting means for detecting a mold temperature.
However, a non-contact type temperature sensor such as an infrared thermometer may be used as the condition detecting means for detecting the mold temperature. Further, the temperature of the cooling water for preventing the mold from excessively rising may be detected as the mold temperature. Further, the amount of the molten metal (the amount of the molten material filled) in one of the cavities may be detected as the condition detecting means.

In this embodiment, the judgment is made by setting the maximum value and the minimum value for the reference temperature of the mold temperature. However, the maximum value is set for the reference shot number (for example, 10 in the die casting molding machine 2 of the embodiment).
The number of times) and the minimum value (for example, five times in the die-casting molding machine 2 of the embodiment) may be provided for the determination. In this example,
Although the judgment is made on the cast product cast by the die casting molding machine, the judgment may be made on the resin molded product formed by the plastic molding machine.

[0027]

According to the present invention, even when a molding machine capable of taking out a plurality of products in one shot is used,
Since discarded products and good products can be automatically determined,
It is possible to prevent a discarded product from flowing out by mistake and a non-defective product from being discarded by mistake.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a discarded product / non-defective product determination device used in a first embodiment of the present invention.

FIG. 2 is a graph showing a relationship between a mold temperature and the number of shots.

FIG. 3 is a flowchart showing a basic control program.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Judgment apparatus of discarded goods and non-defective goods 2 Die casting molding machine 4 Movable mold 7 First cavity 8 Second cavity 9 Third cavity 10 Fixed mold 18 Mold temperature sensor (condition detecting means) 100 Control device 102 Judgment circuit ( Judgment means)

Claims (1)

(57) [Claims] 1. A molding machine having a plurality of cavities for molding a plurality of products by pressurizing a molten material press-fitted in one shot, and (b) a molding machine having one shot. A condition detecting means for detecting a forming condition of a product to be formed; and (c) a forming condition of the product detected by the condition detecting means is manufactured without stability for all products formed in one shot. If the first molding condition is satisfied, all products molded in one shot are determined as discarded products, and all products molded in one shot can be stably manufactured. If the second molding condition is satisfied, all products molded in one shot are judged as non-defective products. If the first molding condition and the second molding condition are not satisfied, one shot is performed. Dumping into multiple products formed by捨打 Chi products and non-defective determination device and a and determination means elegance and good are mixed.