KR20210034570A - System for providing optimum condition for injection molding - Google Patents

Abstract

The present invention relates to a simulation system for injection molding and, more specifically, to an optimal condition providing system for injection molding, which presents optimal molding conditions for an injection molding process in consideration of different characteristics and product specifications among various equipment manufacturers. According to an embodiment of the present invention, optimal conditions including a type of injection molding equipment and molding conditions through the procedure in the injection molding process for manufacturing a predetermined molded product are provided, thereby improving the quality of the molded product while lowering the defect rate of the injection molding process.

Description

System for providing optimal conditions for injection molding {SYSTEM FOR PROVIDING OPTIMUM CONDITION FOR INJECTION MOLDING}

The present invention relates to a simulation system for injection molding, and in particular, to a system for providing optimal conditions for injection molding that proposes optimal molding conditions for an injection molding process in consideration of different characteristics and product specifications among various equipment makers. will be.

Injection molding (射出成型) is a type of plastic molding process, and refers to performing the molding process using a machine collectively referred to as injection molding equipment for injection products colored and compounded according to the purpose.

In general, in the injection molding process, raw materials are heated to have fluidity, melted raw materials are injected into the mold in compression form, injection molded to have a desired shape, and the injected molded product is solidified and taken out of the mold. It will produce the result.

According to such an injection molding process, there is a characteristic that the quality of the result is completely different according to the production maker of the injection molding equipment, the capability of the operator, the degree of skill and experience, and the process time.

This is because the industry does not present the optimal conditions for standardized injection molding, so defects often occur during the injection process, and once defects occur, the equipment must be reset from the previous state through the adjustment time of the injection molding conditions again. There is a problem, and a request for improvement of this problem is emerging.

Accordingly, the present invention intends to implement a simulation system that provides standardized optimal conditions for various injection molding work environments.

Unexamined Patent Publication No. 10-2000-0008046 (Publication date: 2000.02.07.)

The present invention was conceived to solve the above-described problems, and the present invention is to minimize the defect rate of the molded product to be produced, and the types of injection molding equipment shipped from various manufacturers and the molding input to the equipment There is a challenge in calculating the optimal conditions corresponding to the conditions.

In order to solve the above-described problem, the system for providing optimum conditions for injection molding according to an embodiment of the present invention includes an information input unit receiving operation information for a molding process using a plurality of injection molding equipment installed in a workshop, from a database. , Data extraction unit for extracting calculation formulas for a plurality of items for calculating optimal conditions, evaluation results for the plurality of injection molding equipment by applying the work information to the calculation formula according to the characteristics of each injection molding equipment And a logic application unit that calculates an optimum condition and a result output unit that outputs the evaluation result and the optimum condition.

According to an embodiment of the present invention, by providing an optimum condition including the type of injection molding equipment and molding conditions through a procedure in the injection molding process for manufacturing a predetermined molded product, the defect rate of the injection molding process is reduced while molding There is an effect that can improve the quality of the product.

1 is a diagram showing the structure of a system for providing optimum conditions for injection molding according to an embodiment of the present invention.
2 is a diagram schematically illustrating a portion in which an optimum condition provided by an optimum condition providing system according to an embodiment of the present invention is applied to an injection molding equipment.
3 is a diagram illustrating the contents of an evaluation result provided by the system for providing optimum conditions for injection molding according to an embodiment of the present invention.

Prior to the description, when a part of the present specification is said to "equip" or "include" a certain component, it does not exclude other components, but may further include other components unless otherwise stated. It means to be able to.

In the present specification, the term "example" means serving as an illustration, example, or illustration, but the subject matter of the invention is not limited by such an example. And, "comprising", "having", "having" and other similar terms are used, but when used in the claims, as an open transition word that does not exclude any additional or other elements, " It is used generically in a manner analogous to the term "comprising".

In addition, terms such as "... unit, "... device" and "... system" described throughout this specification are an operation in which one or more functions are combined. It means a unit for processing, and this may be implemented in hardware, software, or a combination of hardware and software.

The various techniques described herein may be implemented with hardware or software, or, where appropriate, with a combination of both. As used herein, terms such as "unit", "device" and "system" are similarly treated as computer-related entities, that is, a combination of hardware, hardware and software, software or software at the time of execution. I can. In addition, in the present invention, the system may be configured in a "unit" unit, and may be recorded in one physical memory in a form capable of reading, writing, and erasing, or distributed between two or more memories or recording media.

Hereinafter, a system for providing optimum conditions for injection molding according to an embodiment of the present invention will be described with reference to the drawings.

1 is a diagram showing the structure of a system for providing optimum conditions for injection molding according to an embodiment of the present invention. Each component of FIG. 1 may correspond to a functional configuration by implementing the optimal condition providing system of the present invention in the form of a program executable by a predetermined microprocessor.

Referring to FIG. 1, the system 100 for providing an optimum condition for injection molding according to an embodiment of the present invention includes an information input unit 110 receiving operation information for a molding process using a plurality of injection molding equipment installed in a workshop. , From the database 120, the data extraction unit 130 for extracting a calculation formula for a plurality of items for calculating the optimal condition, according to the characteristics of each injection molding equipment, by applying the work information to the calculation formula, the plurality of It may include a logic application unit 140 for calculating the evaluation result and optimum conditions for the injection molding equipment of the, and a result output unit 150 for outputting the evaluation results and optimum conditions.

The system for providing optimal conditions according to an embodiment of the present invention selects the optimal equipment suitable for the operation from among the equipment currently possessed according to the products ordered from the companies in which a plurality of injection molding equipment is installed, and drives the injection molding equipment. It is characterized in that it provides optimal injection molding conditions.

As a configuration for this, the information input unit 110 includes product and raw materials to be operated, injection machine information for a plurality of injection molding equipment currently installed in the workplace, raw material information used in the process, product information to be manufactured, and a mold used for injection. Information, etc. can be entered.

Typically, raw material information, mold information, product information, and injection machine information managed in an injection molding workshop are shown in Table 1 below.

Raw material information Mold information product information Injection machine information Raw material code Mold code Product code Facility code manufacturer Model customer Equipment name Raw material name Mold name Model manufacturer grade Control Number product name model name color CAVITY Customer C/T Date of production importance Mold TYPE Standard C/T Purchase date Shrinkage rate Gate type Customer S/T Machine number (S/N) Flow index Mold classification Standard S/T Screw diameter Resin properties Mold size (width×length×thickness) Raw material code Injection stroke Additive content Mold weight Mold code Theoretical injection volume Drying temperature Production company Customer facility tonnage Theoretical injection weight Drying time Warehousing date Application injector Injection pressure Maximum moisture content storage Shape complexity Hydraulic gauge injection pressure Melting point Product distance from gate Gross weight Injection speed Cylinder temperature (REAR) Sprue Bush R NET weight Plasticizing ability Cylinder temperature (MIDDLE) Mold drawing SPRUE weight Screw rotation speed Cylinder temperature (FRONT) Cooling circuit diagram Product specification (horizontal) Nose R Nozzle temperature Number of hot runner temperature zones Product use (vertical) Shape method Mold temperature Number of hot runner gates Product specification (normal thickness) Clamping force Back pressure Hot Runner Manufacturing Company Product specification (maximum thickness) Largest open transaction Screw speed Hot runner drawing Projected area ratio Tie bar (horizontal × vertical) ... ... ... ...

The operator may directly input the above information into the information input unit 110 using a predetermined computer terminal, or the information input unit 110 may extract the stored information from a computing device provided in the workplace.

In particular, among the information in Table 1, additional information such as a manufacturer's name, which is not referenced in selecting actual injection molding equipment and calculating molding conditions, may be included. It is collected by filtering.

Specifically, the raw material information for calculating the molding conditions includes drying temperature, drying time, maximum moisture content, rear cylinder temperature (REAR), middle cylinder temperature (MIDDLE), all cylinder temperature (FRONT), nozzle temperature, mold temperature, and back pressure. And data on the screw speed, one or more of the data may be used.

In addition, in the mold information, one or more of a mold type, a gate type, a product distance from a gate, and a sprue bush R may be used.

In addition, in the product information, one or more of NET weight, SPRUE weight, product specification and projected area ratio may be used.

In addition, in the injection machine information, screw diameter, injection stroke, theoretical injection volume, theoretical injection weight, maximum injection pressure, hydraulic gauge injection pressure, maximum injection speed, plasticization capacity, screw rotation speed, nose R, clamping method, clamping force, maximum mold opening One or more of street and tie bars may be used.

The data extraction unit 130 may extract a calculation formula for a plurality of items for calculating an optimal condition from the database 120. In the database 120, a calculation formula for calculating the optimum molding conditions for each item according to the characteristics of the injection molding equipment, products and molds is defined, and the data extraction unit 130 extracts the calculation formula and inputs work information. To be able to do it.

The logic application unit 140 may calculate the selection of injection molding equipment and molding conditions by substituting the work information into the extracted calculation formula.

In the calculation formula for the selection of injection molding equipment, that is, the logic, the attachment of the mold, injection capacity, injection pressure, clamping force, plasticizing ability, etc. can be considered. Specifically, the attachment of the mold is to judge the appropriateness between the size of the mold attachment of the injection molding equipment and the size of the actual mold, and the injection capacity is to judge the appropriateness of the product injection capacity by material and the maximum capacity of the injection machine.

In addition, the injection pressure is a requirement that takes into account the loss between the pressure in the mold and the pressure of the resin, and the clamping force determines the pressure in the mold required for each shape and material of the product. In addition, plasticizing capacity is to judge the appropriateness in consideration of the economic feasibility of the maximum capacity of the injection molding equipment and the weight of the product to be produced.

In addition, in the calculation formula for calculating the molding conditions, items such as cylinder temperature, mold temperature, metering distance, injection pressure, injection speed, holding pressure switching distance, and cooling time may be considered.

Here, the cylinder temperature relates to the average of the demands of the material properties table of the raw material, the experience value constant according to the product thickness, and the multi-stage temperature setting according to the number of heaters, and the mold temperature is the average of the requirements according to the material property table of the raw material and the temperature distribution of the thermal imaging camera. It is to set the mold temperature controller.

In addition, the measuring distance is calculated by converting the product weight, cushion amount, stone bag, and total improvement distance based on the discharge amount per unit of each injection molding equipment and material of raw materials.

In addition, the injection pressure is calculated by calculating the pressure in the injection mold for each raw material in consideration of the pressure loss, and the injection speed is multiplied by a constant according to the cross-sectional area of the mold and product, and the speed standard is set to low, high, and medium speed. To set it up.

In addition, the holding pressure switching distance is for calculating the proper distance by converting 95% of the molding into weight and distance, and for verification through weight, and the cooling time is for considering the raw material material, the performance of the molding injection equipment, and the thickness of the product. will be.

The above-described calculation formula may be determined and adjusted based on the operator's experience.

In addition, the logic application unit 140 may calculate the injection molding condition by applying the calculation formula to 31 items.

The above items include 1) cylinder temperature, 2) fixed mold temperature, 3) moving mold temperature, 4) fixed mold temperature controller temperature, 5) moving mold temperature controller temperature, 6) clamping force, 7) raw materials In-mold pressure, 8) Injection pressure, 9) Hold pressure, 10) Total weighing distance, 11) Hold pressure switching distance, 12) Cushion amount, 13) Suckback, 14) Back pressure, 15) Screw speed, 16) 1st (low speed) ) Injection speed, 17) 2nd (high speed) injection speed, 18) 3rd (medium speed) injection speed, 19) injection speed 1 section, 20) injection speed 2 section, 21) injection speed 3 section, 22) injection time, 23) holding pressure time, 24) weighing time, 25) holding time, 26) cooling time, 27) mold opening time, 28) mold closing time, 29) takeout time, 30) drying temperature, 31) drying time, etc.

The system for providing optimum conditions for injection molding according to an embodiment of the present invention presents optimum conditions for the above 31 items, and the calculation method is as follows.

'값을 고려하여 최대값, 중간값, 최소값을 산출한다.Specifically, 1) The cylinder temperature is a check of the cylinder temperature range registered in the raw material information, and the'normal thickness (t) of the product registered in the product information and the product distance (L) from the gate registered in the mold information

'Calculate the maximum value, the median value, and the minimum value by considering the value.

2) The fixed-side mold temperature is a check of the mold temperature range registered in the raw material information, and the maximum, median, and minimum values are calculated in consideration of the product shape registered in the product information.

3) The mold temperature on the fixed side is set to a value 10℃ below the calculated mold temperature on the fixed side.

4) Set the temperature of the mold temperature controller on the fixed side to a value 5℃ higher than the calculated mold temperature on the fixed side.

5) The temperature of the mold temperature controller on the moving side is set to a value 5℃ higher than the calculated mold temperature on the moving side.

6) The clamping force is a check of the shape information registered in the product information, and the horizontal, vertical, and projected area ratios are calculated, and can be obtained by Equation 1 below.

Here, the'width x height x projected area ratio' is used as the transparent cross-sectional area.

7) In-mold pressure for each raw material is a check of the standard in-mold pressure registered in the technical information, and is set as'standard in-mold pressure × constant value', where the constant value is'product general thickness × product shape × gate type × resin It is calculated as property × "G/F" content × product distance'.

8) Injection pressure is based on the mold pressure calculated for each raw material, and is calculated as'calculated mold pressure x 3'. However, in the case of a hydraulic molding machine, it is converted based on the hydraulic gauge pressure.

9) The holding pressure is calculated as'calculated injection pressure × 0.5'. However, in the case of a hydraulic molding machine, the conversion is applied based on the hydraulic gauge pressure.

10) The total weighing distance is a check of the injection weight per 1mm of the corresponding raw material for each molding machine, and is calculated by the following equation (2).

11) The holding pressure switching distance is calculated by Equation 3 below.

12) Cushion amount is the screw diameter checked in the molding machine information, and the appropriate distance of the cushion amount is applied.

13) Seokbaek is the screw diameter checked in the molding machine information, and the appropriate distance of Seokbaek is applied.

14) Back pressure is a check of the back pressure range registered in the raw material information, and the middle value of the back pressure range is applied.

15) Screw speed is a check of the screw speed range registered in the raw material information, and the intermediate value of the screw speed is applied.

16) The 1st (low speed) injection speed is set to 30% of the maximum injection speed by checking the maximum injection speed of the molding machine information.

17) The 2nd (high speed) injection speed is set to 70% of the maximum injection speed by checking the maximum injection speed of the molding machine information.

18) The 3rd (medium speed) injection speed is set to 50% of the maximum injection speed by checking the maximum injection speed of the molding machine information.

19) The injection speed section 1 is calculated by Equation 4 below from the calculated total weighing distance.

20) The second injection speed section is calculated by Equation 5 below in the first injection speed section.

21) The 3rd section of the injection speed is calculated as the complementary switching distance in the 2nd section of the injection rate.

22) The injection time is calculated by the following equation (6).

23) The holding pressure time is calculated as'injection time × 2'.

24) The weighing time is a check of the plasticizing capacity in the machine information, and after converting the plasticizing capacity in seconds, it is calculated by Equation 7 below.

25) The holding time is calculated as'cooling time-weighing time'.

26) The cooling time is calculated by the following equation (8).

27) Mold opening time is applied by checking the mold opening time in the machine information.

28) The mold closing time is applied by checking the mold closing time in the machine information.

29) The take-out time is applied by checking the take-out time in the machine information.

30) Drying temperature is a check of the drying temperature range in the raw material information, and is set as the middle value of the drying temperature.

31) Drying time is the check of the drying time range in the raw material information, and is set as the middle value of the drying time.

The result output unit 150 may output an evaluation result of the selection result of the type of injection molding equipment calculated according to the above-described calculation method, and the molding condition as an optimum condition. The evaluation results can be displayed in text, tables, diagrams, etc., and the type of injection molding equipment that is most appropriate for the currently ordered product, and the optimum condition is the optimum molding condition to proceed with the process using the equipment. By providing results and optimal conditions, workers in the field can perform work without trial and error.

2 is a diagram schematically illustrating a portion in which an optimum condition provided by an optimum condition providing system according to an embodiment of the present invention is applied to an injection molding equipment.

Referring to FIG. 2, the system for providing optimum conditions of the present invention provides the optimum conditions for injection molding equipment that manufactures products using raw materials such as PE, PP, ABS, and PC. Represents the clamping force inside the mold, the moisture content of the raw material in the hopper, drying temperature, drying time, etc., and the nozzle temperature on the nozzle side, the front temperature in the heating cylinder, the middle temperature, and the rear temperature. ) Negative temperature. In addition, there are screw speed and compounding items on the screw side.

In addition, the temperature controller is in a moving or fixed state, and the temperature accordingly is taken into account, and other injection pressure, injection speed, holding pressure, holding pressure, etc. may be considered as items of optimum conditions.

In addition, in correspondence with the distance from the gate, the cushion amount, the storage switching position, the gate passing distance, the total product distance, and the stone bag among the items may be considered as the items of the optimum condition.

3 is a diagram illustrating the contents of evaluation results provided by the system for providing optimum conditions for injection molding according to an embodiment of the present invention.

Referring to FIG. 3, the evaluation results of the system for providing optimum conditions for injection molding according to an embodiment of the present invention applied to a workplace equipped with 9 injection molding equipments are representative of whether or not molds are mounted and whether or not they are molded for each injection molding equipment. It can include the suitability of the characteristics and the final evaluation, and the operator in the field is referred to in determining the actual equipment to be operated according to the evaluation result.

Here, the mold mounting indicates suitability according to the width, length, thickness, and mold opening distance of the mold for each injection molding equipment, and molding indicates suitability of the injection capacity, injection pressure, clamping force, and plasticizing capacity for each equipment.

The suitability of each characteristic can be classified into'conformity (○)','normal (△)', and'nonconformity (x)', and the final evaluation is determined by comprehensively considering the suitability ratio of each characteristic.

In the drawing, out of the 9 injection molding equipment in the final evaluation, the 7th and 8th units were judged as'suitable', the 6th and 9th units were judged as'normal', and the rest of the equipment were judged as'unsuitable'. . On the basis of this final evaluation, the workers at the site proceed with the work using Units 7 and 8, but can perform the work by flexibly selecting Units 6 and 9 according to the amount of work and schedule.

Although many items are specifically described in the above description, this should be construed as an example of a preferred embodiment rather than limiting the scope of the invention. Accordingly, the invention should not be determined by the described embodiments, but should be defined by the claims and equivalents to the claims.

100: optimal condition provision system 110: data input unit
120: database 130: data extraction unit
140: logic application unit 150: result output unit

Claims (1)

An information input unit for receiving job information including raw material information, mold information, product information, and injection machine information for a molding process using a plurality of injection molding equipment installed in the workplace, and filtering and collecting only data necessary for simulation;
From the database, a calculation formula for a plurality of items is extracted to calculate the optimum conditions for selecting the injection molding equipment suitable for the operation according to the product ordered by the company and providing the injection molding conditions when the selected injection molding equipment is driven. A data extraction unit;
A logic application unit for calculating evaluation results and optimum conditions for the plurality of injection molding equipment by applying the work information to a calculation formula according to the characteristics of the injection molding equipment; And
Includes a result output unit that outputs the calculated evaluation results and optimal conditions as text, table, or schematic evaluation results,
The logic application unit,
For the selection of injection molding equipment, the attachment of the mold to determine the appropriateness between the mold attachment size of the injection molding equipment and the size of the actual mold, injection capacity and pressure in the mold to determine the appropriateness of the product injection capacity by material and the maximum capacity Snowfall in consideration of injection pressure, which is a requirement to consider loss from resin pressure, clamping force to determine the necessary pressure in the mold by product formation and material, and economic response according to the maximum capacity of the injection molding equipment and the weight of the product to be produced. The evaluation result is calculated by substituting the work information into the calculation formula for the plasticizing ability to determine
The plurality of items above,
Cylinder temperature, fixed mold temperature, moving mold temperature, fixed mold temperature controller temperature, moving mold temperature controller temperature, clamping force, mold pressure by raw material, injection pressure, holding pressure, total weighing distance, holding pressure switching distance, cushion amount , Seokbaek, back pressure, screw speed, 1st (low speed) injection speed, 2nd (high speed) injection speed, 3rd (medium speed) injection speed, injection speed 1 section, injection speed 2 section, injection speed 3 section, injection time, Including one or more of holding pressure time, weighing time, holding time, cooling time, mold opening time, mold closing time, takeout time, drying temperature and drying time,
The raw material information includes at least one of drying temperature, drying time, maximum moisture content, all cylinder temperature, central cylinder temperature, rear cylinder temperature, nozzle temperature, mold temperature, back pressure, and screw speed,
The mold information includes at least one of the size of the mold (horizontal dimension × vertical dimension × thickness), mold shape, gate type, product distance from the gate, and sprue bush radius (R),
The product information includes at least one of net weight, sprue weight, product specification and projected area ratio,
The above evaluation results are:
Appropriate, normal and unsuitable for each item of mold mounting or not, which indicates the suitability of injection capacity, injection pressure, clamping force, and plasticizing capacity according to the width, length, thickness and mold opening distance of each injection molding equipment A system that provides optimal conditions for injection molding that has been visualized.

Images