KR102099474B1 - Method and Apparatus for Generating Tool Path - Google Patents

Abstract

The present invention relates to a method and apparatus for generating a tool path, comprising: a photographing unit for photographing a tool image and a workpiece image; An input unit that receives processing drawing information; And analyzing tool image and workpiece image photographed through the photographing unit to calculate tool shape information and workpiece shape information, respectively, based on the calculated workpiece shape information and machining drawing information input through the input unit. It includes a control unit that calculates one cutting power of the machining and generates a tool path for each of the two machining.

Description

Method and Apparatus for Generating Tool Paths {Method and Apparatus for Generating Tool Path}

The present invention relates to a method and apparatus for generating a tool path, and more specifically, to obtain a tool image and a workpiece image using a camera, and to check a cutting / mouth condition according to a movement path of a tool based on the machining drawing information. It relates to a method and apparatus for generating a tool path that can generate and control the movement path of the.

With the development of machine tools and cutting tools, the development of machining technology is also accelerating, and the workpiece can be processed easily and conveniently.

However, in the prior art, in the grooving process combined with the outer diameter sulfur / finishing process, the depth of the groove is performed by grooving for all areas defined as the shape when grooving the complex shape of the deep groove and the shallow groove. There is a problem that the cutting force increases exponentially as it deepens.

In addition, in the related art, a tool path generation method has been applied according to the skill of the operator by performing a machining by generating a tool path using an operator manually or using a specific program. At this time, the tool path is generated through the sensory analysis rather than the numerical analysis, and thus the consideration of the cutting force is insufficient, leading to an increase in machining time, wear of the tool, and a decrease in machining quality.

This specification has been devised to solve the problems as described above, and collects information such as a tool mounted on a turret based on machining drawing information, tool shape information, and workpiece shape information during grooving, and moves the tool to the path of movement of the tool. It is an object to provide a method and apparatus for generating a tool path for generating an optimal tool path accordingly.

Another object of the present specification is to provide a method and apparatus for generating a tool path that minimizes tool changes and reduces cutting forces generated during grooving, thereby improving the quality of the machining surface and reducing the machining time.

In order to achieve the above object, according to a first embodiment of the present specification, a tool path generating device according to the present specification includes: a photographing unit photographing a tool image and a workpiece image; An input unit that receives processing drawing information; And analyzing tool image and workpiece image photographed through the photographing unit to calculate tool shape information and workpiece shape information, respectively, based on the calculated workpiece shape information and machining drawing information input through the input unit. It includes a control unit that calculates one cutting power of the machining and generates a tool path for each of the two machining.

According to a second embodiment of the present specification, a method for generating a tool path according to the present specification includes: receiving a tool image and a work piece image, and receiving processing drawing information; Analyzing the photographed tool image and the workpiece image to calculate tool shape information and workpiece shape information, respectively; Calculating one cutting power of outer diameter turning and grooving based on the calculated workpiece shape information and input machining drawing information; And creating a tool path for each of the two operations.

As described above, according to the present specification, a tool image and a work piece image are secured by using a camera, and a tool's movement path is generated and controlled by checking the cutting / mouth condition according to the tool's movement path based on the processing drawing information. By providing a method and apparatus for generating a tool path that can be performed, it is possible to minimize an increase in cutting force and time required due to a non-conformity of the tool path, and to increase the completeness of a work piece by calculating an optimal tool path.

In addition, even an unskilled person can calculate the optimal tool path and increase the completion of machining based on the automatically generated tool path.

1 is a view showing the configuration of a tool path generating device according to an embodiment of the present invention,
2 is a view showing the configuration of a control unit according to an embodiment of the present invention,
3 is a flowchart illustrating a method for generating a tool path according to an embodiment of the present invention.

It should be noted that the technical terms used in this specification are only used to describe specific embodiments and are not intended to limit the present invention. In addition, technical terms used in this specification should be interpreted as meanings generally understood by a person having ordinary knowledge in the technical field to which the present invention belongs, unless defined otherwise. It should not be interpreted as a meaning, or an excessively reduced meaning. In addition, when the technical term used in this specification is a wrong technical term that does not accurately represent the spirit of the present invention, it should be understood as being replaced by a technical term that can be correctly understood by those skilled in the art. In addition, the general terms used in the present invention should be interpreted as defined in the dictionary or in context before and after, and should not be interpreted as an excessively reduced meaning.

In addition, the singular expression used in this specification includes the plural expression unless the context clearly indicates otherwise. In the present application, the terms "consisting of" or "comprising" should not be construed as including all of the various components, or various steps described in the specification, among which some components or some steps It may not be included, or it should be construed to further include additional components or steps.

In addition, the suffixes "module" and "part" for components used in the present specification are given or mixed only considering the ease of writing the specification, and do not have a meaning or a role distinguished from each other by itself.

Further, terms including ordinal numbers such as first and second used in the present specification may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components. For example, the first component may be referred to as a second component without departing from the scope of the present invention, and similarly, the second component may be referred to as a first component.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings, but the same or similar elements will be given the same reference numbers regardless of the reference numerals, and redundant descriptions thereof will be omitted.

In addition, in the description of the present invention, when it is determined that detailed descriptions of related known technologies may obscure the subject matter of the present invention, detailed descriptions thereof will be omitted. In addition, it should be noted that the accompanying drawings are only for easy understanding of the spirit of the present invention and should not be interpreted as limiting the spirit of the present invention by the accompanying drawings.

The apparatus for generating a tool path according to the present invention correlates the cutting edge length (l) of bytes with respect to the cutting edge angle (Cs), the cutting depth (d), the cutting thickness (t), and the feed length (f) of the tool according to machining. The relationship is used to perform processing to reduce cutting power generated during cutting. The correlation of each coefficient described above is as shown in Equations 1 and 2 below.

According to Equations 1 and 2, as the side cutting edge angle increases, the actual cutting edge length becomes longer and the cutting thickness becomes thinner, so the cutting power per cutting edge length is reduced compared to the bite, thereby increasing the tool life. That is, it can be seen that the cutting power is minimized when turning the outer diameter rather than the grooving. Accordingly, in one embodiment of the present invention, the optimal tool path is calculated by maximizing outer diameter turning and minimizing grooving.

1 is a view showing the configuration of a tool path generating apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the tool path generating apparatus 100 according to the present invention utilizes a set-based processing technique among image processing techniques to reduce cutting force generated during grooving, processing drawing information and tools A tool's movement path is generated based on the shape information and the workpiece shape information. To this end, the tool path generating apparatus 100 may include a photographing unit 110, an input unit 120, a control unit 130, and an output unit 140. Here, the tool path generation device 100 may be a kind of computing device operated by a program or the like for generating a tool path by processing a workpiece, and may be used by being connected to or included in a worker's computer or portable device. The tool may include various cutting tools such as a bite, a drill, a milling cutter, a reamer, a gear tooth cutter, a thread cutter, and a broach.

The photographing unit 110 includes at least one camera, and after photographing a tool processed by a tool and a tool of an operating machine using at least one camera, the photographed tool image and the processed image are transferred to the control unit 130 send. The photographing unit 110 may photograph tools and workpieces in real time while the machine tool is operating, and photograph tools and workpieces at various angles. On the other hand, the photographing unit 110 is not connected to the tool path generating device 100, it may be installed outside, that is, mounted on a machine tool or installed in the vicinity of the machine tool. In this case, the tool path generating apparatus 100 may receive an image photographed by the photographing unit 110 through a communication unit (not shown). In addition, the photographing unit 110 may transmit an image of the machine tool to the tool path generation device 100 using a mobile phone of an operator. If the photographing unit 110 is fixed in one direction, the tool and the workpiece may be photographed using a portable camera or a mobile phone equipped with a camera capable of communicating tools and workpieces at various angles.

The input unit 120 receives the processing drawing information from the operator, and transmits the input processing drawing information to the control unit 130. In addition, the input unit 120 may receive information necessary for tool path generation, in particular, a tool path calculation algorithm, a camera control algorithm, an image calculation algorithm, tool-related information, and workpiece-related information. Here, the input unit 120 may generate a user input signal corresponding to the user's request or information according to the user's operation. In addition, the input unit 120 may be implemented with various input means that are currently commercialized or commercially available in the future. For example, the input unit 120 may include a general input device such as a keyboard, mouse, joystick, touch screen, and touch pad.

The control unit 130 controls the image capturing unit 110 according to a camera control algorithm to adjust the image focusing and the angle of view in order to photograph the tool and the workpiece. The controller 130 collects images including one or more tools and workpieces transmitted from the photographing unit 110 and analyzes the images collected through the image calculation algorithm to calculate tool shape information and workpiece shape information.

In addition, the controller 130 generates an optimal tool path based on the machining drawing information, the tool shape information, and the workpiece shape information according to the tool path calculation algorithm. In detail, the control unit 130 calculates the cutting power once according to the path through which the cutting edge angle of the bite passes based on the workpiece shape information and the machining drawing information, and is processed by outer diameter turning and grooving according to the tool path calculation algorithm If there is no part that is not machined by outer diameter turning and grooving by calculating the part not to be processed, the machining with a small cutting power once, that is, the maximum point that can be machined into a tool shape for external turning After creating the tool path, a tool path for other machining, ie grooving, is created. To this end, the control unit 130 according to the present invention may include an image processing unit 131, a cutting power calculation unit 132, and a tool path generation unit 133, as illustrated in FIG. 2.

The image processing unit 131 analyzes the tool image and the workpiece image to grasp the tool shape and the workpiece shape, and generates tool shape information and workpiece shape information, respectively.

The cutting power calculation unit 132 calculates the cutting power once according to the path through which the cutting edge angle of the bite passes based on the workpiece shape information and the machining drawing information. In detail, the cutting power calculation unit 132 calculates a single cutting power for outer diameter turning and a single cutting power for grooving.

The tool path generation unit 133 calculates a part that is not machined by outer diameter turning and grooving according to a tool path calculation algorithm, and if there is no part that is not machined by outer diameter turning and grooving, it is cut once during both machining For small-power machining, a tool path for machining to the maximum point that can be machined into a tool shape is created, and a tool path for other machining is generated. Here, the tool path calculation algorithm follows Equation 3 below.

Here, A means the shape of the workpiece, B means the shape of the tool, and E means the tool path.

When Equation 3 is applied, when the tool shape B is moved to the element position of the tool path E, the tool shape Bz moving in the z direction should be in the element of the workpiece shape A. That is, it means that the image of the tool can fit within the image of the workpiece shape, which is the same principle as removing (processing) the workpiece image according to the tool path based on the image of the tool.

The apparatus 100 for generating a tool path according to the present invention identifies a path that a tool can pass and a path that a tool cannot pass through set-based image processing, and also allows a tool to pass, but is by tool shape or of a tool path. When the tool path is set by non-optimization, it is possible to calculate the optimal tool path through repetition of the above-described process.

The output unit 140 is a means for providing a user with a recognition result or an operation result of the tool path generating device 100, for example, a display unit visually output through a screen, a speaker outputting audible sound, etc. It may include. In particular, the output unit 140 may display a tool image, a workpiece image processed by the image processing unit 131, and a tool path generated by the tool path generation unit 133 on the screen. Further, the output unit 140 may display a tool and workpiece image analysis screen, a tool path calculation screen, and a processing drawing screen according to the processing drawing information.

The tool path generating device 100 configured as described above may be a computing device that is convenient for the operator to carry, and may include, for example, a worker's laptop, a smartphone, and the like where the tool path program is installed. In addition, the tool path generating device 100 is a computing device fixed in a work room, and for example, a computer (desktop) on which a tool path program is installed may be included in the tool path generating device 100.

Then, the tool path generating method for generating the optimal tool path through image processing in the tool path generating apparatus 100 configured as described above will be described in detail with reference to the accompanying drawings.

3 is a flowchart illustrating a method for generating a tool path according to an embodiment of the present invention.

Referring to FIG. 3, a tool image and a work piece image are taken, and processing drawing information is input (S310).

The tool image and the work image are analyzed to grasp the tool shape and the work shape to generate tool shape information and work shape information, respectively (S320).

Based on the workpiece shape information and the machining drawing information, one cutting power is calculated according to the path through which the cutting edge angle of the bite passes (S330). In detail, one cutting power of outer diameter turning is calculated, and one cutting power of grooving is calculated.

Subsequently, according to the tool path calculation algorithm, a portion that is not machined by outer diameter turning and grooving is calculated (S340), and it is determined whether there is no portion that is not machined by outer diameter turning and grooving (S350).

If there is no part that is not machined by external turning and grooving, create a tool path for machining with the smallest cutting power of one of the two machining to the maximum point that can be machined into a tool shape. Create a tool path (S360).

The tool path generation method according to the present invention confirms a path that a tool can pass and a path that a tool cannot pass through set-based image processing, and also allows a tool to pass but is not optimized by tool shape or non-optimization of the tool path. By setting the tool path, it is possible to calculate the optimal tool path through repeated execution of the above-described process.

The above-described method can be implemented through various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

For implementation by hardware, the method according to embodiments of the present invention includes one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs) , Field Programmable Gate Arrays (FPGAs), processors, controllers, microcontrollers and microprocessors.

In the case of implementation by firmware or software, the method according to embodiments of the present invention may be implemented in the form of a module, procedure, or function that performs the functions or operations described above. The software code can be stored in a memory unit and driven by a processor. The memory unit is located inside or outside the processor, and can exchange data with the processor by various known means.

The embodiments disclosed herein have been described above with reference to the accompanying drawings. As described above, the embodiments illustrated in each drawing should not be interpreted as being limited, and may be combined with each other by those skilled in the art who understand the contents of the present specification, and when combined, some components may be omitted.

Here, the terms or words used in the specification and claims should not be interpreted as being limited to ordinary or dictionary meanings, but should be interpreted as meanings and concepts corresponding to the technical ideas disclosed in this specification.

Therefore, the embodiments shown in the embodiments and the drawings described in this specification are only exemplary embodiments disclosed in the present specification, and do not represent all of the technical ideas disclosed in the present specification, and thus can replace them at the time of application. It should be understood that there may be equivalents and variations.

110: recording unit 120: input unit
130: control unit 131: image processing unit
132: cutting power calculation unit 133: tool path generation unit
140: output

Claims (9)

A photographing unit for photographing a tool image and a workpiece image;
An input unit that receives processing drawing information; And
By analyzing the tool image and the work piece image taken through the photographing unit, tool shape information and work piece shape information are respectively calculated, and outer diameter turning and grooving are performed based on the calculated work piece shape information and the processing drawing information input through the input unit. A control unit for calculating a single cutting power of and generating a tool path for each of the two operations;
Including,
The control unit calculates a part that is not machined by outer diameter turning and grooving, and when there is no part that is not machined by outer diameter turning and grooving, after generating a tool path for machining with a small cutting power once during both machining , Tool path generation device, characterized in that for generating a tool path for different machining. delete According to claim 1,
The control unit is a tool path generation device characterized in that for generating a tool path for machining the smallest cutting power to the maximum point that can be processed into a tool shape. According to claim 1,
The control unit according to the following equation (1) tool path generating device characterized in that for calculating the portion that is not processed by outer diameter turning and grooving.
[Equation 1]

Here, A is a workpiece shape, B is a tool shape, E is a tool path, z is a z-axis, and Bz is a tool shape moving in the z direction. According to claim 1, The control unit,
An image processing unit configured to analyze tool image and workpiece image photographed through the photographing unit and calculate tool shape information and workpiece shape information, respectively;
A cutting power calculation unit that calculates a single cutting power of outer diameter turning and grooving based on the calculated workpiece shape information and processing drawing information input through the input unit; And
The maximum point that can be machined in the shape of a tool for machining with a small cutting force of one of the two machinings when there is no part that is not machined by outer diameter turning and grooving by calculating the part not machined by external turning and grooving A tool path generation unit that generates a tool path for processing until and then generates a tool path for other processing;
Tool path generation device comprising a. Taking a tool image and a work piece image, and receiving processing drawing information;
Analyzing the photographed tool image and the workpiece image to calculate tool shape information and workpiece shape information, respectively;
Calculating one cutting power of outer diameter turning and grooving based on the calculated workpiece shape information and input machining drawing information; And
Creating a tool path for each of the two machining;
Including,
After the step of calculating the cutting power once,
Calculating a portion not processed by outer diameter turning and grooving; And
Determining whether there are no parts that are not processed by outer diameter turning and grooving;
Further comprising,
If there are no parts that are not machined by external turning and grooving, creating a tool path for generating a tool path for another machining after generating a tool path for a smaller cutting power once Way. delete The method of claim 6,
A tool path generation method characterized by generating a tool path for processing to a maximum point that can be machined into a tool shape for a small cutting power. The method of claim 6,
A method of generating a tool path, characterized by repeatedly performing the process of calculating the one-time cutting power or the process of generating the tool path to generate an optimal tool path.

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