KR102755768B1 - Cutting processing apparatus and method using simulation - Google Patents

Abstract

The present invention relates to a cutting processing device and method utilizing simulation to improve the quality of a machined object using a cutting processing device, and has the feature of searching for a cutting path satisfying cutting conditions through simulation, and inputting the cutting path into a cutting device that processes an actual object to process the object. In addition, it has the feature of changing the cutting path and conducting simulation when the conditions required during actual processing are not satisfied. Through this, it has the advantage of producing a finished product with a low defect rate.

Description

{Cutting processing apparatus and method using simulation}

The present invention relates to a cutting processing device and method, and more particularly, to a cutting processing device and method utilizing simulation for cutting and processing an object to form a final shape.

Cutting processing equipment performs drilling and surface cutting processing on objects such as synthetic resins such as plastics and metals. In general, cutting processing equipment is studied with a focus on increasing productivity through factors such as cutting speed and cutting path. However, focusing on productivity leads to the problem of lowering the quality of the workpiece.

The surface quality of the object being cut is affected by the temperature generated during cutting. When the cutting power of the cutting device is increased to increase productivity, the problem of surface quality deteriorating due to overheating generated during processing occurs.

In addition, when determining the cutting path by focusing on productivity without considering factors such as the material of the target object and the cutting processing device used, a simple pattern or a straight path is determined first. When the path is straight, when the path changes at a right angle, the tool's progress speed slows down near the vertex, and the temperature of the part where the progress direction changes increases. The concentrated part overheats, affecting the final shape and surface quality of the target object. Therefore, research on the cutting path is required to improve the quality of the target object.

Korean Patent Publication No. 10-2019-0090462, Device and method for minimizing machining time of CNC machine tool and recording medium for performing the method

Accordingly, the present invention has been made to solve the problems of the prior art as described above, and provides a cutting processing device and method utilizing simulation that can solve the problem of a target being overheated along a cutting processing path, resulting in poor surface quality and final shape.

In addition, there is usually a difference between the results of simulation (theoretical values) and the results in the actual environment. The user's know-how is required to compensate for the difference, and it is difficult to obtain results that meet the target through simulation before processing in the actual environment. Therefore, the present invention provides a method for continuously compensating for the difference between the simulation environment and the actual environment and generating an optimized processing path.

The present invention comprises a virtual unit including an input unit for receiving a shape of a target object and cutting conditions and a cutting path, a simulation unit for cutting the target object according to the input cutting conditions and cutting path, an analysis unit for analyzing stress and deformation of the cut target object and comparing it with required stress and deformation criteria, and an output unit connected to an external device and outputting the cutting conditions and the cutting path to the outside if the required stress and deformation criteria are satisfied, and a cutting unit including a cutting tool for processing the target object by receiving the cutting path and cutting conditions from the output unit, wherein the virtual unit is characterized in that if the processed target object does not satisfy the stress and deformation criteria, the cutting path is changed and the simulation is re-executed.

In addition, the cutting unit further includes a monitoring unit including a temperature measuring unit that measures the temperature generated from the target object during cutting processing and a cutting force measuring unit that measures cutting force through a load generated from a power source during cutting processing, and if the temperature and cutting force measured by the cutting unit do not satisfy a temperature standard and a cutting force standard, the virtual unit changes the cutting path and re-executes the simulation.

In addition, when the temperature and cutting force measured in the cutting section satisfy the temperature criterion and the cutting force criterion, the virtual section is characterized in that it utilizes the input cutting path and cutting conditions as initial data.

In addition, the monitoring unit further includes a shape measuring unit that monitors the final shape and surface of the cut object.

In addition, the present invention includes a virtual cutting start step in which the shape of the object is input into the computer program, a cutting path input step in which one of one or more cutting paths stored in the computer is selected, a cutting condition input step in which the computer receives cutting force and cutting temperature, a simulation step in which the program performs a simulation along the input cutting conditions and cutting path, a stress and strain analysis step in which the stress and strain of the object according to the progress of cutting are analyzed, a cutting data generation step in which the cutting path and cutting conditions input into the computer are stored when the stress and strain of the object satisfy preset stress conditions and strain conditions, a cutting path and cutting condition input step in which the cutting data stored through the simulation are input into a cutting device including a cutting tool, and a cutting processing step in which the cutting device cuts the object along the input cutting data.

In addition, if the stress and strain analyzed in the stress and strain analysis step do not satisfy the preset stress conditions and strain conditions, the cutting path is changed in the cutting path input step and the simulation is re-run.

In addition, the cutting processing step further includes a cutting force and cutting temperature measuring step in which a cutting force measuring unit measures cutting force and a temperature measuring unit measures cutting temperature, and if the cutting force and temperature measured in the cutting force and cutting temperature measuring step do not satisfy preset cutting force conditions and temperature conditions, the cutting path is changed in the cutting path input step and the simulation is re-executed.

In addition, the cutting processing step further includes a cutting force and cutting temperature measuring step in which a cutting force measuring unit measures cutting force and a temperature measuring unit measures cutting temperature, and when the cutting force and temperature measured in the cutting force and cutting temperature measuring step satisfy preset cutting force conditions and temperature conditions, the cutting path input step includes a data storage step in which the cutting conditions and cutting path satisfying the cutting force conditions and temperature conditions are used as initial data.

In addition, after the cutting processing step, the monitoring unit includes a shape analysis step for monitoring the surface quality and shape accuracy of the target object after cutting.

In addition, the cutting path input step is characterized by searching for a cutting path of an object having a similar shape based on the shape of the input object.

The present invention has the effect of reducing the defect rate by searching for a path that satisfies required conditions through simulation before actual processing.

In addition, it has the advantage of continuously compensating for the difference between the simulation environment and the actual environment through continuous monitoring during actual processing, and creating an optimized processing path.

Figure 1 is a configuration diagram of the present invention.
Figure 2 is a flow chart of the present invention.
Figure 3 is an example of a cutting path.
Figure 4 is an example of a route change.
Figure 5 is an example of active control.

The present invention can have various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that all modifications included in the spirit and technical scope of the present invention are included.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless expressly defined in this application.

Hereinafter, with reference to the attached drawings, a cutting processing device and a cutting processing method utilizing simulation according to an embodiment of the present invention will be described in detail.

FIG. 1 is a block diagram of the present invention. Referring to FIG. 1, the present invention comprises a virtual unit (100) including an input unit (110) for receiving a shape of an object and cutting conditions and a cutting path, a simulation unit (120) for cutting an object according to the input cutting conditions and cutting path, an analysis unit (130) for analyzing stress and deformation of the cut object and comparing it with required stress and deformation criteria, and an output unit (140) connected to an external device and outputting the cutting conditions and cutting path to the outside when the required stress and deformation criteria are satisfied, and a cutting unit (200) including a cutting tool (220) for receiving the cutting path and cutting conditions from the output unit (140) and processing the object, and the virtual unit (100) is characterized in that, when the processed object does not satisfy the stress and deformation criteria, the cutting path is changed and the simulation is re-executed.

The virtual unit (100) is a computer that includes an input device, an output device, and an operation device. It can be connected to the Internet and various devices. The virtual unit (100) includes a program that inputs the shape of an object and performs cutting processing. The program can output the cutting processing result.

The virtual unit (100) includes an input unit (110) that receives the shape of an object and cutting conditions and a cutting path, a simulation unit (120) that cuts an object according to the input cutting conditions and cutting path, an analysis unit (130) that analyzes stress and deformation of a cut object and compares them with required stress and deformation criteria, and an output unit (140) that is connected to external equipment and outputs cutting conditions and a cutting path to the outside when the required stress and deformation criteria are satisfied.

The virtual unit (100) receives cutting paths by connecting a storage device in which one or more cutting paths are stored to the input unit (110). In addition, the shape of the object and cutting conditions are input by operating the connected storage device or input device. The simulation unit (120) conducts simulation through one cutting path, the shape of the object, and cutting conditions. The analysis unit (130) analyzes the stress and deformation of the object that has been cut. If the required stress and deformation conditions are satisfied, the output unit (140) generates data by grouping them into one data.

The cutting unit (200) receives data from the output unit (140) and performs cutting processing. The cutting unit (200) includes a cutting tool (220) that cuts an object, a power unit (210) that transmits power to the cutting tool (220), and a control unit (240) that controls the cutting tool (220) and the power unit (210). In addition, it includes a data storage unit (230) that stores data. The cutting unit (200) cuts an actual object along the same conditions and the same cutting path according to the data received from the output unit (140).

The above cutting unit (200) includes a monitoring unit (250) including a temperature measuring unit (251) that measures the temperature generated from the target object during cutting processing and a cutting force measuring unit (252) that measures cutting force through the load generated from the power source during cutting processing.

The monitoring unit (250) includes a shape measurement unit (253) that monitors the final shape and surface quality of the cut object.

Figure 2 is a flow chart of the present invention. The present invention is characterized in that when an object is to be processed, a virtual cutting process is performed to search for a cutting path, and then actual processing is performed along the searched cutting path. The virtual cutting is performed on a computer that includes a program that receives the shape of the object, a program for processing the object, and a program that can analyze stress and temperature generated during processing. The worker can operate an input device connected to the computer and check the results through an output device.

Referring to FIG. 2, the present invention includes a virtual cutting start step (S100) in which the shape of an object is input into a computer program, a cutting path input step (S110) in which one of one or more cutting paths stored in the computer is selected, a cutting condition input step (S120) in which the computer receives cutting force and cutting temperature, a simulation step (S130) in which a simulation is performed along the input cutting conditions and cutting path, a stress and deformation analysis step (S140) in which the stress and deformation of the object according to the cutting progress are analyzed, a cutting data generation step (S150) in which the cutting path and cutting conditions input into the computer are stored when the stress and deformation of the object satisfy preset stress conditions and deformation conditions, a cutting path and cutting condition input step (S210) in which the cutting data stored through the simulation is input into a cutting device including a cutting tool, and a cutting processing step (S220) in which the cutting device cuts the object along the input cutting data.

In the cutting path input step (S110), the worker or the program selects one of multiple cutting paths stored inside or outside the computer. The cutting path may be selected by referring to one or more of several factors, such as the material, size, and shape of the input object. For example, if a cutting path for an object with a similar shape is searched based on the shape of the input object, the program receives the corresponding cutting path.

In the cutting condition input step (S120), conditions for cutting a virtual object are input into the program. The cutting device cuts the object through drilling, laser processing, etc. The cutting conditions input into the program can be changed depending on the cutting device that is available. The cutting conditions include cutting force and cutting temperature. In the simulation step (S130), a simulation is performed for cutting the object according to the cutting path and cutting conditions input into the program.

In the stress and strain analysis step (S140), the program monitors the target object during virtual cutting processing and analyzes the stress and strain occurring in the target object. The program determines whether the analyzed stress data and strain data satisfy the set stress conditions and strain conditions. If the stress and strain analyzed in the stress and strain analysis step do not satisfy the preset stress conditions and strain conditions, the cutting path input step (S110) is characterized by changing the cutting path and re-running the simulation.

For example, it is determined whether the measured stress during virtual cutting satisfies the preset stress conditions. If the measured stress is greater than the preset stress conditions, it returns to the cutting path input step (S110) and changes the cutting path. In addition, it is determined whether the deformation generated during virtual cutting satisfies the preset deformation conditions. If the deformation generated is greater than the preset deformation conditions, it returns to the cutting path input step (S110) and changes the cutting path. A detailed description of the cutting path change will be described later.

In the cutting data generation step (S150), if both the stress conditions and the deformation conditions are satisfied, the program converts the cutting conditions and cutting path into cutting data of an actual processing device to generate data. For example, it is stored as data applicable to CAM (Computer Aided Manufacturing).

The cutting device start step (S200) operates the cutting device by the operator's operation. The cutting path and cutting condition input step (S210) inputs the cutting path and cutting conditions obtained through simulation into the actual processing device. The actual processing device includes a power unit, a cutting tool, a data storage unit, a control unit, and a monitoring unit. The cutting processing step (S220) processes the target object according to the input conditions of the processing device.

The cutting force and cutting temperature measurement step (S230) measures the temperature generated in the target object during actual cutting processing. A monitoring unit including a temperature measurement unit is placed inside the cutting device or adjacent to the cutting device. Temperature measurement is performed using a non-contact sensor that can measure from a distance.

In addition, the cutting force generated by the cutting device during processing of the target object is measured. The actual cutting device cannot measure stress like the simulation program, and the stress is indirectly predicted through the cutting force. The cutting force can be calculated through the torque generated by the cutting device.

The control unit determines whether the measured cutting temperature and cutting force satisfy the preset temperature conditions and cutting force conditions. If the cutting force and temperature measured in the cutting force and cutting temperature measurement step (S230) do not satisfy the preset cutting force conditions and temperature conditions, the cutting path is changed in the cutting path input step (S110) and the simulation is re-executed.

That is, even if the optimal cutting path is derived through simulation, if the temperature and cutting force measured during actual processing do not satisfy the conditions, the cutting path is re-explored through simulation. For example, when re-simulating, the stress conditions and deformation conditions are lowered and the path is re-explored. The optimal cutting path is searched through repeated simulations and actual cutting processing, and the cutting process is completed.

When comparing the simulation and the actual environment, differences in results appear and correction is required. In general, the know-how of the operator is required to adjust the difference between the simulation and the actual result, and the difference is adjusted by directly adjusting. Therefore, it is difficult to obtain results that meet the target through simulation before processing in the actual environment. The present invention has the advantage of providing a method for continuously correcting the difference between the simulation environment and the actual environment through the cutting force and cutting temperature measurement step and generating an optimized processing path.

If the cutting force and temperature measured in the cutting force and cutting temperature measurement step (S230) satisfy the preset cutting force conditions and temperature conditions, the cutting path input step (S110) includes a data storage step (S250) that uses the cutting conditions and cutting path satisfying the cutting force conditions and temperature conditions as initial data.

After the cutting processing step (S220), the monitoring unit includes a shape analysis step (S240) for monitoring the surface quality and shape precision of the target object after cutting. In the shape analysis step (S240), the monitoring unit having a shape measurement unit monitors the shape precision and surface quality of the completed workpiece and stores the image data together.

Fig. 3 is an example of a cutting path. Referring to Fig. 3, the cutting path can start from one side of the object and move in a zigzag pattern at regular intervals, and can start along the outer contour and move inward while cutting. In addition, there are cutting paths such as a Hilbert curve and a Fermat spiral that proceed along a regular shape pattern. The cutting path is formed so that the paths do not intersect.

The operator selects one of the various cutting paths and conducts a simulation. At this time, the virtual part is characterized by receiving the shape of the object before selecting the cutting path and suggesting the cutting path according to the shape of the object. The virtual part searches for a history similar to the shape of the object among the existing work history and suggests the previous cutting path. This has the advantage of reducing the defect rate.

The virtual part can reflect variables such as the type, size, and tool rotation speed of the machining tool included in the machining device during simulation. At this time, the virtual part of the present invention has the characteristic of preferentially changing the machining path to satisfy the required conditions.

The computer receives the shape of the object and cutting conditions as input. The program in the computer performs cutting processing on the input object. The input object can receive a 3D shape.

A virtual object is cut out in the program. The program analyzes the stress and temperature generated in the object. The stress generated in the object is difficult to measure in reality, but there is an advantage in being able to measure stress through simulation.

Fig. 4 is an example of a path change. If the stress conditions and temperature conditions that occur during simulation processing are not satisfied, the path is changed and the simulation is performed. Referring to Fig. 4, if the existing path has a straight line shape, the path can be changed to a curved shape. If the path is a straight line shape, there is an advantage in that the program is advantageous in generating the cutting path. However, if the path is changed to a right angle, the tool progresses slowly near the vertex, and the stress and temperature of the concentrated area increase. Therefore, by changing the cutting path to a curve so that the cutting speed is constant, the problem of local dissatisfaction can be solved.

If there is an overall problem rather than a local condition dissatisfaction during virtual processing, a path with a completely different pattern from the existing path is selected and re-executed.

Figure 5 is an example of active control. Referring to Figure 5, the cutting unit continuously monitors the data measured during cutting processing, and if the conditions are not met, transmits the data to the virtual unit. The virtual unit continuously sends feedback to the cutting unit. This has the advantage of being able to search for the optimal cutting path.

Data exchanged between the virtual and cutting parts is stored in the cloud. Even if the cutting part is not connected to the virtual part, data can be input from the cloud and cutting processing can be performed.

The present invention is not limited to the above-described embodiments, and the scope of application is diverse, and various modifications can be implemented without departing from the gist of the present invention claimed in the claims.

100 : Virtual Department
110: Input section 120: Simulation section
130: Analysis section 140: Output section
200 : Cutting section
210: Power Unit 220: Cutting Tool
230: Data storage unit 240: Control unit
250 : Monitoring Department
251: Temperature measurement unit 252: Cutting force measurement unit
253: Shape measurement section

Claims (10)

Input section for receiving the shape of the target object, cutting force, cutting temperature, and cutting path;
A simulation section that cuts the target object according to the input cutting force, cutting temperature, and cutting path.
An analysis section that analyzes the stress and deformation of the cut object and compares the analyzed stress and deformation with the required stress and deformation criteria, and
A virtual section including an output section that is connected to external equipment and outputs cutting data according to cutting conditions and cutting path to the outside when the required stress and deformation criteria are satisfied, and
A cutting unit including a cutting tool for processing a target object by receiving a cutting path, cutting data, and cutting conditions from the above output unit,
The cutting unit further includes a monitoring unit including a temperature measuring unit that measures the temperature generated from the target object during cutting processing, and a cutting force measuring unit that measures cutting force through the load generated from the power source during cutting processing.
A cutting processing device utilizing simulation, characterized in that the virtual part compares the cutting force and cutting temperature of the object machined from the cutting part with the cutting force and cutting temperature of the input part, and if not satisfied, changes the cutting force, cutting temperature, and cutting path and re-executes the simulation.
delete In the first paragraph,
A cutting processing device utilizing simulation, characterized in that when the temperature and cutting force measured in the cutting section satisfy the temperature criterion and the cutting force criterion, the virtual section utilizes the input cutting path and cutting conditions as initial data.
In the first paragraph,
A cutting processing device utilizing simulation, wherein the monitoring unit further includes a shape measuring unit that monitors the final shape and surface of a cut object.
The virtual cutting start stage, where the shape of the object is input into the computer program.
A cutting path input step for selecting one of one or more cutting paths stored in the computer;
Cutting condition input stage where the computer receives cutting force and cutting temperature.
The program has a simulation stage where simulation is performed along the input cutting conditions and cutting path.
Stress and strain analysis step to analyze the stress and strain of the object according to the cutting progress;
When the stress and deformation of the target object satisfy the preset stress and deformation conditions, a cutting data generation step for storing the cutting path and cutting conditions entered into the computer.
A cutting path and cutting condition input step that inputs cutting data saved through simulation into a cutting device including a cutting tool.
The cutting device is a cutting processing step that cuts the target object according to the input cutting data, and
It includes a cutting force and cutting temperature measuring step in which the cutting force measuring unit measures the cutting force during processing and the temperature measuring unit measures the cutting temperature.
A cutting processing method utilizing simulation, characterized in that the cutting force and cutting temperature measuring step determines whether the measured cutting force and cutting temperature satisfy the conditions by comparing them with the cutting force and cutting temperature input in the cutting condition input step, and if not satisfied, changes the cutting conditions and cutting path in the cutting path input step and re-executes the simulation.
In paragraph 5,
A cutting processing method utilizing simulation, characterized in that if the stress and strain analyzed in the above stress and strain analysis step do not satisfy the preset stress conditions and strain conditions, the cutting path is changed in the above cutting path input step and the simulation is re-executed.
delete In paragraph 5,
A cutting processing method utilizing a simulation including a data storage step in which, when the cutting force and temperature measured in the above cutting force and cutting temperature measuring step satisfy preset cutting force conditions and temperature conditions, the cutting path input step utilizes cutting conditions and cutting paths satisfying the cutting force conditions and temperature conditions as initial data.
In paragraph 5,
A cutting processing method utilizing simulation, which includes a shape analysis step for monitoring the surface quality and shape accuracy of a target object after the above cutting processing step.
In paragraph 5,
The above cutting path input step is a cutting processing method using simulation, characterized in that it searches for a cutting path of an object having a similar shape based on the shape of the input object.